Dear friends!

If you get a blank data from METEOR-M N2, please report it here.  We can together help engineers quickly solve the problem  If someone does not speak English  write in your native language  please.  Thank’s!

¡Queridos amigos!

Si usted recibe los datos ‘vasio’ del Meteor-M N2, escribir en esta sección por favor. Juntos podemos ayudar a los ingenieros a resolver rápidamente el problema  Si alguien no habla Inglés, escribir en su lengua materna por favor. ¡Gracias!

Дорогие друзья!

Если Вы получили «пустые» данные с Метеора-М №2, пожалуйста, напишите в этом разделе. Вместе мы можем помочь быстро устранить неисправность. Если кто-то не говорит по- английски, пишите на русском или на своем родном языке. Спасибо!

Экран_1   Экран_2

Blank data (left) and normal data (right)  on the screen spectrum analyzer


17.07.2015  07.44 UTC restored

Метеор-М №2_LRPT_2015-8-7-10-28

07.08.2015  07.36 UTC restored

2015-8-7-15-41-51_64 2015-8-7-15-41-51_65 2015-8-7-15-41-51_68

07.08.2015 15.41 UTC

2015-8-8-5-28-43_64 2015-8-8-5-28-43_65 2015-8-8-5-28-43_66 2015-8-8-5-28-43_68

08.08.2015  05.28 UTC :: AMIGOS 

1235 (64,65,66,68) Switching channels 68 to 66

Метеор-М №2_LRPT_2015-8-10-11-8-58-706_raw.dat2015-8-10-15-15-49-187.s_123

10.08.2015, 08.08 UTC ::  ROBONUKA (Moscow, Russia)



11.08.2015, 09.29 UTC  Testing the new AmigosViewer

Left — AmigosViewer (ver.2015.6.11.007 was created by ROBONUKA)

Right — AmigosViewer  (ver.2015.6.11.007 was modified by Vasili).


18.08.2015 05.28 UTC

2015-8-18-7-10-36_64  2015-8-18-7-10-36_65 2015-8-18-7-10-36_68

18.08.2015 07.10 UTC



 18.08.2015  08.50 UTC  

Switching channels 68 to 66

2015-9-23-6-55-14-Default Palette-rectified  LifeNews_amigos

23.09.2015  06.55 UTC

Life News: “Сбой был обнаружен благодаря фотоснимкам радиолюбителей, на которых отчётливо видна смена ракурса съёмки.”



23.09.2015  restored


16.11.2015  Switching channels


AmigosViewer shows the data from the Meteor-M N2 and Meteor-M N1


19.11.2015  00.07 UTC Data from the M2 and M1 competed

2015-12-2-10-26-29-302_123_remapped_jpg_m1 2015-12-2-9-27-10_123

02.12.2015, 09.26 UTC :: Simon and  AMIGOS

METEOR-M N1 is rotated again


12.12.2015, 07.32 UTC :: Simon

Meteor M1 rotated, nice view of Mediterannean and Earth’s horizon

RUSSIA 2015-12-22-18-12-28-335_123_jpg_m1

22.12.2015,  17.12 UTC :: Simon

M1 image from tonight’s pass


22.12.2015, 17.07 UTC :: AMIGOS


2016-3-20-12-32-30_123 2016-3-20-13-57-6_123

20.03.2016,  12.32  /  13.57 UTC  :AMIGOS

M1: 123 (RGB)


Troubleshooting: 263 комментария

    1. ROBONUKA Автор записи

      Hi Howard,

      You need edit *LRPTDecoder*.ini. And set in [OUT] VCDU=NO, or path=’path with not denied place’


  1. Tof "ZeTofZone"


    (Information come from APT GROUP in FaceBook)
    Seem that positioning was restored earlier this day, but APID 68 (IR) is out of range.

  2. Dennis

    On Aug 24 and 25, had four Meteor passes with predicted elevation more than 45 degrees above the horizon, but saw absolutely no signal on 137.1 or 137.9 using SDR#. However, the NOAA signals are coming in OK, but I’m under the impression that Meteor M N2 has a stronger transmitter and thus I was assuming Meteor signals would be stronger than NOAA sats. Using outside coaxial sleeve antenna. I haven’t been able to find a web site that reports «official status» so I am puzzled. I live in central Washington state.

    1. ROBONUKA Автор записи

      Hi Dennis!
      Sorry for the long silence, we participated at the exhibition.
      If the problem persists, please write in detail about the equipment, the time of reception, screenshots, etc.
      There is an official website of the organization operating the satellite METEOR-M N2:
      There is an English-language forum for satelite amateur radio:
      Good luck!

  3. ROBONUKA Автор записи

    Vasili upgraded AmigosViewer to generate a color image 125!
    To create 64,65,68 images (JPG) and 125(123-automatically)-color image (JPG) we should change ini-file:


    P.S. Only for History part.

  4. Леонид

    Пытаюсь реконструировать изображение из готовых файлов .vcdu. Получаю на изображении много полос и помех. Смотрю содержимое .vcdu и вижу в нем пакеты, у которых есть только сигнатура 0x08 [0x40..0x46], но метка времени, счетчик пакетов, QFactor и другие признаки разбиты. Скажите, добавляется ли ,vcdu-файлы что-то ещё, кроме самих пакетов? Если интересно, могу прислать образец .vcdu, картинку и детальное указание мест в .vcdu, где содержатся такие странные пакеты

    1. ROBONUKA Автор записи

      ЦУП в курсе проблем с ориентацией. Сейчас они пытаются исправить.



      This two progress bars are actually for the file processing. First bar is the file
      percentage of the file processing (for TCP mode it is not actually). Second bar is
      filling percentage of the processing memory buffer.

  5. Simon

    So for TCP mode processing (using in conjunction with Vasilij’s C# demodulator), only the second bar is important? And this second bar should not reach 100 % if I understand you correctly (i.e. you run out of memory if 100 % are reached)?

    1. Simon

      Thanks for letting us know! too bad I have already missed half of the pass. 🙂 In the morning (7:34 UTC) it was still on 137,100, but now I was just wondering why no signal received on the second passs. Currently it is transmitting strong signal on 137,900 MHz. Will it stay on the new frequency?

  6. Simon

    M1 is indeed transmitting 1-2-3 images, but, as expected, all are black during night passes.
    I think I am going to miss the channel 5 IR image, which was much sharper than the one from M2.

  7. Simon

    In the last few days I got the following problem with receiving Meteor M1:

    during a good pass with strong signal I have lock on the signal and the picture starts showing upp in the Analizer, but then just stops (timestamp goes on in Analizer, bo ni additional iamge lines are shown). If I stop and restart the analizer, it again starts showing decoding the image. Is this a known bug? It occurs only with Meteor M1.

  8. john gilbert

    This morning m2 decoding gave a cross on input at regular time periods, I will measure on my .s file and report. At same time cross appeared the decoder lock dropped and then relocked. I will link the file in next few days.

  9. ROBONUKA Автор записи

    volkoff_58 wrote:
    АЛЯРМ!!! АХТУНГ!!! ВНИМАНИЕ!!! Сегодня 8.12.2015 в 18-15 Метеор-М №2 переходит на 137,9!

      1. Simon

        They have probably changed M2 frequency because in about a week both satellites (M1 and M2) will be above the horizon at the same time at certain times during a day. With two separate receivers you will be able to receive data from both satellites at the same time nevertheless.

  10. Simon

    Any new information about M2 LRPT transmitter? The orbits of M1 and M2 are not overlaping anymore (at least at above my location), if that was the reason to turn off LRPT on M2.

          1. Blackbolt

            I am heartbroken by this. I made my entire antenna set up from scratch just for Meteor-M N2 and cannot receive it. 🙁 🙁

            The only great thing is while M2 is down, M1 is up and I am very happy about that.

            Let’s keep our fingers crossed that M2 LRPT is turned back on.

            P.S. Thank You all for the software to do this. I wish there was a way to get the SDR plugin to start recording a baseband IQ .wav file @ AOS.

  11. Rick

    I’m having trouble getting the QPSK demodulator in SDR# (using SDRSharp.Meteor.dll) to lock, even when SNR is above 20 dB. I got it to lock the first time I tried about a week ago and got a decent image from N1, but no longer. Any ideas?

    1. Blackbolt

      Mine locks around 8-9db. Your tracking frequency being sent is wrong, most likely. If the pc clock is accurate, try plugging in 137.0968 MHz as the frequency for Meteor-M N1. I had to manually record the baseband IQ file, and go back later playing with the VFO frequency to get it to lock because mine would never lock either with 137.1000… I found this frequency lets me lock as soon as the signal is strong enough.

      Let me know if this helps you and please upload pics if you get some good captures.

  12. Rick

    Night pass just now (64 degrees) and with your suggestion of 137.0968 I did get a lock. It took awhile but it did lock at a SNR of about 16 dB then lost it at about 8 dB. Satellite signal seems much weaker than I get from NOAA 19, where I get +/- 2 degree images. Anyway the image from N1 tonight was very choppy — not much of anything. I am not sure how to upload an image, but I will try now to put up an fairly decent image I got a couple of weeks ago (my first try). I think you might only get the file name — I don’t have a web location to put it…..

    — Rick


    1. Blackbolt

      Glad that frequency helped you but you definitely have some sort of other issue.. Are there other signals in the frequency range of the satellite? What’s your FFT display and waterfall look like from 137.050 to 137.150, is it clean?

      Rick wow you get a lot of coverage like I used to before I moved… When I first built my antenna, I was picking up at 5 degrees on Meteor-M N2 and at about 10 it was enough signal to get a lock. Now it doesn’t show hardly any signal until its on top of me yet after that it is wonderful all the way till about 5-10 degrees.

      So before I moved coverage: 5 degrees until 5 degrees, I had strong signal for a picture
      After I moved coverage: 45 degrees until back down to 5 degrees, regardless of day or night (opposite directions). == I cannot understand why I have a dead zone when it is approaching but after it’s on top or passed the antenna it’s great like it used to be, DAY OR NIGHT. When it’s approaching from the north in the day, I don’t get any signal even showing up until it’s around 20 degrees and then it’s very weak until almost overhead. When approaching from south, same thing, bad signal until it’s on top of me. Doesn’t that rule out the antenna and surroundings since day and night come in two different directions yet my problem is the same?

      What antenna are you using? If you built it yourself can you send me some pics or instructions? At this point I would like to try a different antenna to see if mine is the problem. Thinking of building one out of PVC and wire.

      1. Peter

        Hi Blackbolt ,
        Cees is correct, nothing wrong with your antenna.
        MN1 ‘s lrpt antenna seems to be poiting 45 degrees backward,
        possible dammaged during its launch.

        ps: we are all waiting for MN2 to transmit again,
        lets hope it will not take too long anymore.

  13. Cees

    Wait a moment with the antenna to the M-H2 is operational again.
    The antenna of the MH 1 is damaged wrote Happysat.
    Signal is the same by me.Behind is much stronger.

    1. Blackbolt

      Thank you Cees for that. So M1 signal is weak on the approach. I thought of that but was not sure. Thank you for the confirmation!!

    2. Blackbolt

      As for M2, I am sad because of no LRPT in a long time. 🙁 I hope they fix issue but does not look good since broken so long.

  14. Rick

    Hi Blackbolt — FFT looks good for the whole pass except for three or four blips due to some strong airline traffic (l’m near an airport), but the image is more messed up than that. The constellation display on the SDR# plugin looks ok except that it sometimes rotates even though it says it’s locked. Not sure what’s going on.

    My antenna is a home brew Jerry Martes double cross design — works great; better than a previous QFH I built. Here’s a picture of it:

    Also, here’s a NOAA 19 image from yesterday:

    I’ve been copying NOAA APT for awhile but I’m really interested in LRPT — didn’t know it existed until recently! Thanks to those who have written all the software!

    Let’s hope N2 returns….

    1. Blackbolt

      Hey Rick. Thanks for the reply and pics! Your new antenna looks awesome!! What does your old QFH look like? I’m going to go snap a pic of mine right quick….. I thought about building the dipole type like you have, was it hard? tell me about it, please!!!! 🙂

      Here you go. It’s an infinite balun type mad out of COAX cable, lol. I’m not even sure if it’s the right length but I can tell you it’s very directional to horizontal signals.

      1. Rick

        Hi Blackbolt,

        I built the double-cross back in 2009 after Jerry wrote an article in QST magazine (Feb, 2008 issue). It was not particularly hard and one of the benefits of the design is that it is very tolerant of dimensions, etc. Here is a link to one article that describes it:

        As I remeber, the QST article was very detailed, and used brass rods instead of 6mm diameter copper. Anyway,there seems to be a lot on the internet about it so a google search would give you a lot of info. I think I even saw a youtube video on constructing one once.

        Here’s a pic of my old QFR — it also is a COAX infinite balun design. Using an HP network analyzer (at work) I tuned up the dimensions until it performed well at 137 MHz — very finicky!

        There is an overhead pass of N1 tonight at 7 PM local that I will try to copy. I’m not sure I have all the latest software, plugins, etc….


          1. Blackbolt

            Thank you very much for the articles!!!

            I am in Louisiana, but notice I cannot receive until Satellite is almost overhead, only with M1. Happens the same but from opposite direction at night, so I know it isn’t a problem with my setup, or surroundings, it’s due to M1 antenna damage… That being said I would like to try a new antenna for fun…

            Here is the S file you requested for testing purposes.


          2. Blackbolt

            If you need me to I can provide you with a baseband IQ file to play in SDR sharp of Meteor M1 to test to see if there is an issue with your radio reception. I used to post process all of my IQ files after reception, then I built software to real-time process into much much smaller IQ files during reception with no data loss to decode using the original way after. We are talking GBs to MBs difference lol.

            I’ll have to custom make something (so it can be stored and downloaded easily online.. but it will work to help you find the problem you have…. Tomorrow though it’s late here , im off to bed 🙂 ) Let me know if you need this…..
            73s 🙂

  15. Rick

    Hey Blackbolt,

    Thanks for the .s file. It decodes very well! So I know that LRPTofflineDecoder works. Last night I had a big crash problem with the computer that I use for the station (Dell laptop) and I have been reinstalling Windows and all the other software on a new SSD. So I am hoping that with fresh installs of all the components, things will work, but it will take some time. I have noticed that the online tutorials for putting everything together are not all that up to date, so it’s a bit of an experiment.

    73’s Rick

    1. Blackbolt

      Hi Rick,

      You are very welcome. I have a passion for this so I am glad to spread my joy. 🙂

      I am sorry to hear about your laptop crashing. A new SSD with a fresh install is going to make that PC fly!! I really hope you get all of that ironed out. I’ll be waiting to see some results!!

      1. Rick

        All back together now. There was a pretty good (45 degree) pass of M1 just now but almost no signal (6 dB SNR at best), so no copy. I wonder if the satellite is in the proper orientation. Have you been able to copy recently? I’ll try again at 7:30 AM EST.


        1. Pete


          Managed to get a pretty strong signal from M1 this morning. Usuable file for approximately 8 minutes with no «lines». My QTH Lat 30S Lon 30E. Using a QFH cut to 137 Mhz and a home brew 3 stage preamp with 1XBF891 and 2xBFR91. Orientation looks OK.

        2. Blackbolt

          Going to try and post a pic here so you can see it using html, and a link just in case lol 🙂
          This is my pass this morning at 8:30CST / 9:30 EST, 14:30 UTC.

          Note that I am in Louisiana, and receive little to no signal until M1 is on top of me. Then it spikes and locks. My best SNR today was 18dB but only after it was overhead.

        3. Blackbolt

          Remember Rick, with M1 you won’t really receive a signal until it’s basically over/on side of your location and falling. So my signal this morning on the near overhead pass started around 60 degrees when it locked, and then lasted until 5 degrees. Look at my picture I am at the bottom of Louisiana… I barely get coverage north of Louisiana but get it like mad south. With M2 I got coverage from Canada until Mexico and beyond sometimes lol.

          1. Rick

            Hey Blackbolt,
            Finally got this back together — one problem was that I had forgotten to increase the rf gain if SDR#! Too many settings… I got a decent pass this morning west of me and a max elevation of about 35 degees. Here’s the link to it:


            My version of the demodulator plug-in (v1.7) has a control for the PLL frequency, which defaults to 100; any suggestions on a better setting? Also, I forgot to lower the RF frequency from 137.1 MHz as you suggested earlier, but it still eventually got a lock.

            Another general question is that it seems that the only way to specify the .s file name for LRPTofflineDecoder is the edit the .ini file. Not too convenient.. Am I missing something?


  16. Pete

    M N1 Sat — Some info that may be useful. Here in RSA (Durban) I can get decode lock +/-30 deg elevation on approach and hold lock till 10 deg going away. My setup:- SDR#1430 with the modrtlsdr (driver mod) which allows deimation. Select RTL-SDR(R820T) in the source. Play with the LNA/Mixer/VGA gain to have a base signal of +/-50dBFS. Mixer and VGA typically 50% and LNA 75%. Too much mixer and vga gain introduces too mauch noise.
    I use sample rate of 1.4MSPS and Decimation 8. The bandwidth is set to 115000. I record a basedand file and decode without any problems — a nice clean 8-9 minute pass. I don’t need to resample to 130K with audacity. Decode direct.

    Regards Pete

    1. Rick

      Hi Pete,

      Thanks for the info. I have that mod all set up in SDR# and I will give it a try on the next good pass. I assume you decode the .wav file from SDR# with LrptRx? And I also assume that you point LRPToffline Decoder to the .raw file from LrptRx — is that correct? I have previously been pointing LRPTofflineDecoder to the .s file from the QPSK demodulator plugin in SDR#.



      1. Blackbolt


        «Another general question is that it seems that the only way to specify the .s file name for LRPTofflineDecoder is the edit the .ini file. Not too convenient.. Am I missing something?» :
        What on earth? Can you elaborate on this question? I have no idea what you mean by this.

        If you mean loading the .s file for the decoder to work with, just press the 72k button 🙂 … is there another way to do it 🙂 !!???

        Set your PLL to 200 instead of 100. This helps a lot. I’ve even tried 400 and it works fine.. anything over this though and it wanders around too much. 200 seems to be the best imo.

        Can you guys explain why using the decimating capable driver helps ? I know what decimation does, but what advantage does it have here?

        My setup is simple: SDR dongle (820T2), SDR#, the meteor and DDE plugins controlled by Orbitron. When the sat. passes, it’s all automated, and locks-> produces the .S file (because I like to save them), then I put it into LRPTOfflinedecoder. If I happened to want to record just the bandwidth of the meteor in an IQ file i can do that with the other plugin. So where does having a decimating driver help here? Please explain 🙂

        Tomorrow i’m doing it different though and using the decoder «online» but will still save the .s file just in case.

        1. Blackbolt

          P.S. my 820T2 is running at 1024MSPS. I find it produces the least noise. I also simply leave my settings on TUNER AGC ON, RTL AGC OFF. Is there a better way to improve this? I do get signal earlier (floats around 8dB for a good bit before overhead) but it doesn’t lock until 9 dB above noise floor and doesn’t lose it until about 7dB which is roughly 5-10 degrees after descending.

  17. Pete

    Hi Rick,
    I don’t use the «s» file at all. I record a baseband IQ wav file and then manually import and decode the baseband file in lrptRX.exe to produce a raw file. I then use LRPToffLineDecoder_2014.11.13.0014.exe to decode and produce the BMP image. I then use smooth meteor to rectify.

    I find that the Photoshop «Topaz Clarity» plugin does a GREAT job to enhance the image.Brings out exceptional detail on the final image. If get a few lines in the image, I use «Inpaint» to remove the lines.
    Inpaint does quite a neat job in filling in the detail where the line was.

    This is a relatively new game for me, and am not shy to experiment and share my experiences.

    It sound like you have your setup configured to automate the entire capture process. I do each step manually. I’m a typical BBT — Born Before Technology HA HA

    I have a web page for astronomy. will post my images there in due course.


  18. Pete

    Hi Rick,

    Something I forgot to mention. From my messing around with the meteor sat images, I find that the base noise figure plays quite an important roll in SDR# in getting a good lock on the signal when decoding. With my system I aim to get a base noise level round about 60 to 55 dBFS by adjusting the LNA/Mixer/VGA settings without comprimising to much on the signal from the sat. Typically the LNA is set to 75% and the Mixer/VGA set no higher than 50%. WIth this I get 25 to 30 dB signal above the noise floor depending on sat elevation. My pre-amp is a real backyard home brew job but works well.
    There are quite a few OrbComm sats transmitting in the 137 Mhz band throughout the day and night. I use these «sats» to try and optimise on the signal to noise ratio when M1 is not in sight.
    If you would like to communicate on a more personal level, drop me an email:


    1. Blackbolt

      Hey there Pete,

      I used to do it the way you do. I do find it the most fun and interesting.

      Do you have any schematics for your homebrew amplifier please? I would like to build one!! 🙂

      1. Pete

        Hi There Blackbolt.

        Sure, drop me an email. See address above. Will reply with schematics and some pics. The amp is a 3 stage. Stage 1 uses a BF981, Stage 2 — BF981, stage 3 BFR91. These are old transistors. It’s a mixture of amps found on the net. Had a few issues with it due to «intermodulation» but a simple shield did the trick. I also detuned it a bit to make it more stable. Under the circumstances the noise figure appears to be quite low.


      2. Rick

        Hey Pete,

        I tried your setup this morning and it worked great! No dropouts at all. Unfortunately I started recording about 2/3 of the way through a decent pass, but I got a lock right away and stayed locked until the sat fell to about 3 degrees.

        I’m not sure what really made the difference here since I changed two things at the same time: 1) the modification to allow decimation; 2) the us of LrptRx to decode the baseband data. I will try to sort that out next time — direct overhead pass of N1 early tomorrow morning.

        Here’s the image:

        It’s kind of dark and murky, so net step is to play around with image processing. The Topaz Clarity thing looks like a purchase, so I’ll try other things first.

        Oh, and Blackbolt — the .ini file has a section for specifying an input file for automatic processing:

        ;»filename» specifies a file will be processed automatically
        filename=C:\LRPT\sdrsharp decimation 1\Recordings\Meteor_001.raw

        When I comment that out, it asks for a source file when I hit the 72K button — much better:)

        1. Pete

          Hi Rick,

          Great image. I just love it when a plan comes together. Am please to hear that the new setup worked for you. I believe the decimation bit helps quite considerably. There is an older version of SDR# with decimation here.
          The top file in white is the one to download. Worthwhile playing with.

          The Topaz thing is a purchase, but drop me an email and I will show you a trick or two. Email address is in my previous posting above. For some reason this posting split it with a dash. absamail is one word.


          1. Blackbolt

            Rick I took mine and yours and put them together you and I have a good bit of overlap. I get the gulf states + the gulf + mexico usually. I’m in Louisiana.

            My signal is part of AMIGOS and I was the only one who provided a signal for the USA coverage on the EAST coast this morning, Luc’s signal seems to be down at the moment. It would be great if you could start adding your signal into the amigos server as well….



  19. ROBONUKA Автор записи

    Hello, gentlemen!
    Would you like to send us a links of your best january meteor’s images to the gallery?
    Blackbolt, your name will appear in the list of AMIGOS statistics very soon!
    Stanislav 73

          1. Rick

            Hey Blackbolt,

            Here’s the antenna:

            It’s a good design, but I think being up high and having the pre-amp right there makes a big difference. In the old days (1970ish) I had a steered 4-turn helical beam, but this double crossed dipole works just as well. It’s not perfect — I can’t copy to my north as well as every other direction. But I can get up to the top of Hudson Bay.


    1. Pete

      I can get a good lock on the IQ file in lrptRx.exe but no image from the raw file. A very strange signal in SDR#.
      Maybe it’s a good time to switch M2 LRPT back on.

      Lets wait a see what happens.

    1. Blackbolt

      Gladly. I look forward to Meteor images every day. This week I am leaving for around 5:30-6:00am, but I will leave my PC on to capture my portion of M1… I hope LRPTOfflineDecoder starts and doesn’t close right away (as if no TCP) so I can transmit to AMIGOS server. Yesterday it did it for the first time for unknown reason. I have not change any settings and it work fine afterwards.

  20. Pete

    Hi Blackbolt,

    Are you still interested in my home brew pre-amp. I have no way of posting the schematics. However I am in contact with Rick via email. I could send them to Rick and maybe he will be kind enough to post on his dropbox.

    For Rick. Will this be OK with you?

    Another trick I want to try is mount the «SDR-RTL Dongle» right at the QFH antenna and pre-amp. Then run 5 or 10 meters of USB cable to the PC. The school of thought is that the data is digital and therefore no signal drop. Maybe will gain a few dB of signal and get a better noise ratio. Also clip on a few ferrite «clip-ons» to remove noise from the outer sheath of the cable.

    Pete (South Africa)

    1. Blackbolt

      Yes Pete, I would love to try and build the home brew pre-amp!!

      I built a new QFH antenna… My old one was made out of coax and used the infinite balun method. My new one is made out of copper wire and uses the choke balun method. I am not having a lot of luck with it. It’s the same exact dimensions, etc… IT’s not working as well for me.. not sure if it’s due to the balun method or what.

      Both of my QFH antennas have been very directional and should not have been. The original antenna I built was the infinite balun one as I just mentioned and it worked great but was always directional. I literally had the antenna marked and would go turn it to follow the satellite!! For example, if it was EAST I pointed east and the signal would pick up dramatically and move it as it traveled northeast to southeast.. NOT how a QFH is supposed to work!! I should be able to turn it any direction and pick up signal.

      This new antenna is no different except the sensitivity is quite lower (at times). On approach with M1 I used to get 8dB, almost a lock once it hit around 30 degrees (overhead pass). Now I get like 6dB in same scenario, and the maximum signal is also about the same. I used to get 14-16db overhead, now getting 12dB. The other night though I was on the new antenna and M1 was malfunctioning. I got 18db+ on the new antenna!! The last few days have been bad weather, and the passes have been far east and west, so maybe it’s that.. I could swear though that my old antenna performed better.

      Right now my setup is the new QFH with choke balun method, the antenna is 8 awg copper wire!! . That connects at the top.. and I just installed a snap-on choke just under the connections where the coax begins right before the choke balun.

      Any ideas? I’m thinking of modifying this antenna to be taller and skinny for better horizon coverage, and also possibly changing back to infinite balun method. Either way each QFH ive built, even the first one which was best performing, have all been directional 🙁

      When I say directional I mean NORTH SOUTH EAST WEST (horizontally). I do not know if they are directional vertically or not since the strength of the signal varies with elevation.. but I doubt it is. I feel like I shouldn’t have to point it north when its coming from the north, I should be able to position it for lowest noise floor and be done with it.

      Oh and one more thing (sorry so long). I have this weird phenomenon which happens when I turn the QFH. The noise floor suddenly goes from -51db to -48db!. Even if I turn it SLOW it doesn’t gradually go from 51 to 48, it JUMPS there is a huge line on the waterfall dividing the noise difference!! I noticed both antennas have done this as well!! I have taken the antenna in my hand and sat on my roof and turned it and it does this. Is the antenna suddenly resonating with the noise/signals bouncing off the roof? I also notice any signals I receive are JUMPING up as well!! IT’s like I suddenly turn the gain on the radio one notch up!

      1. Pete

        Hi Blackbolt,

        Have sent schematics to Rick for posing in his dropbox. Have fun building it. The amp gives me about 25 to 30dB above the noise floor when M1/M2 is right above, which I think is quite good. The transistors types are quite old but have quite a respectable noise figure.

        Sounds like you have a very similar problem that I found with my QFH. Mine is made from 6mm copper electrical cable cut to 137.5Mhz. It is mounted 3 meters above ground verically but found it to be very sentitive when I rotate it. To the extent that I loose signal almost completely. Turning my QFH also has quite an effect on the base noise in SDR#.

        Eventually found the sweet point. A QFH antenna should not behave in this manner. I can’t explain why. I used the OrbComm sats to optimize the orientation and maximise the signal by slowly turning the the anntena. My neigbours think I have lost my marbles.

        For the balun, I coiled 5 turns (tightly wound) of RG58 Co-Ax around the center support which is 50mm PVC pipe right at the top. RG58 is not the best Co_Ax, it’s quite lossy but it was all I had. The amp is mounted on the same center support.

        My initial tests to mount the RTL-SDR dongle right at the amp on the QFH appears to give me an extra couple of dB. Still need to verify and test some more.

        DO you have a «metal» roof. If so it’s acting as a ground plane, which I believe is not good for a QFH. I have also heard that mounting height should be mutliples of 1/4 wave lengths — odd multiples. Example 1, 3, 5, does help in these situations. Give it a try.

        1. Blackbolt

          Pete-«My neigbours think I have lost my marbles.» I nearly died laughing. This is me exactly. I climb onto my truck then into my roof and am out their in the freezing cold turning the antenna as sats pass. .. I only get a few shots per day with the weather satellites and my work schedule… I tried to use orbcomm sats but im not sure what their signal look like other than the dashes or the frequency. I always see two long bars coming and going at around 137.250 and 137.325ish.. And further up see some of the horizontal dashes.

          Pete my roof is not metal.. Look at my qfh pictures I posted however there is metal gutter and a metal l bracket for something that spans the side. You are right about the qfh.. Now that I have the middle of the antenna sealed I need to run a long usb and out the dongle up there. What a terrific idea…

          Rick-i appreciate if you can post his schematics!!! Remember Meteor m1 does not have any infrared imagers so I doubt you will see anything at night except black… M2 I used to pick up the one infrared and see earth but the other two channels were black….

        2. Blackbolt

          Pete also my first qfh and the first place I lived I was near an open field. I am at this home too but would prefer not have to go outside and put . he antenna in the field every morning…

          Any ways my point is On my first qfh I received m2 in a wide open field with clear horizons… The antenna was still very directional and was about 8 ft off the ground. Pure wood and coax with the infinite balun design…

    2. Blackbolt

      Old antenna: This was an infinite balun type made of all coax. Worked great, but directional horizontally.

      New antenna: This is made out of 8 gauge copper wire, choke balun at connection/top. Works OK (maybe better if I could figure out its best position), but directional as well like the above one.

      Both are the exact same dimensions, height, widths, and QFH legs.

  21. Rick

    Pete — I would be glad to post your schematics. Go ahead and email them to me.

    Also, it seems that M1 produces an image only when it is in daylight — I got a good pass this morning and another yesterday morning (I have not gotten onto AMIGO yet). When I try to copy the night passes, I get a signal but just a black image. I seem to recall reading that the satellite has a battery problem and so when the solar panels are not in light, some systems shut down?


    1. Pete

      Hi Rick,

      I have also found that night passes of M1 produces black images with no detail at all. Shortly after M1 launce, it had battry failure. But the solar panels kept charging. It is believed that years of charging has caused a chemical reaction «short circuit» that allows electrons to flow when the solar panel are in sunlight. It’s the solar panels that power up the necessary circuitry to transmit images during the day.

      By the way, mounted the RTL-SDR dongle at the antenna for a try. Appears that I get a good couple of extra dB’s. I’m using a 10m USB cable with no problems. Must still do more trials to confirm my initial findings. I use RG58 co-ax cable under normal circumstances which is quite lossy. Cheers

    1. Blackbolt

      Rick thank you for posting it!!

      Pete thank you for the info and the notes as well!!

      I have read that pre-amps only work if coax line is > X length. Do you find this true or does it really help? Where do you have the pre-amp mounted?


      1. Rick

        Hey Blackbolt, your very welcome. As long as all impedances are matched to the 50 Ohm RG58, the cable length should not matter (other than the fact that the longer the cable, the greater the loss through it). The preamp helps to overcome cable losses, so it should be mounted close to the antenna. Putting the dongle close to the preamp is a great idea because the cable loss from the preamp to the receiver is eliminated altogether; the preamp is still needed because the noise figure of the preamp is much better than that of the dongle. Let’s let Pete weigh in on this too.

        Happy soldering!


  22. Pete

    Hi Blackbolt,

    Rick gave a pretty neat explaination of the bennifits of the pre-amp.

    When I 1st installed the pre-amp, it was at the computer side of the co-ax. This is against all convension and nulifies the pre-amp bennifits. It did not work at all. Just amplified noise from the 10m co-ax cable. Moved it to the antenna. It is mounted 500mm below the balun on the center pole of the QFH. It defintely works. WIthout it the signal peaks about 15dB above the noise floor. WIth it the signal peaks at 25 — 30 dB depending on sat elevation.

    We must also remeber that these cheap DAB+FM+DVB-T dongles are designed for TV use and are actually 75 ohm input. Not sure of the effect of using 50 ohm, maybe a dB or to loss???. SWR should not present too much of a problem as we are not transmitting.!!!!!!!!!!

    From my experience, the co-ax length is not critical. I use 10 meters (30 Feet). But I believe that odd mutiples of 1/4 wave lengths also applies. Same as for the mounting height. HAVE FUN and keep up the good work.

  23. Rick

    Hey Blackbolt,

    Can you give me a quick lesson on how to use the AMIGO viewer? Mostly when I hit start, it says «connection established», then «Transfer aborted». Sometimes it will then start to put up an all-black image. Is there another way to view the images people put on the server? I have been getting some good images and would like to share them.


    1. Blackbolt

      Pete and (Rick): «WIthout it the signal peaks about 15dB above the noise floor. WIth it the signal peaks at 25 – 30 dB depending on sat elevation.» Wow are you serious? 10-15db gain, is that for real??? !!!!!!! What is powering the pre-amp? I have looked over the schematics for a short while but have been having to get up at 5am to do the «Walmart Project» .I am updating all of the store’s computers to Windows 7, lol 🙂 ,. I have been leaving the computer on to capture M1 automatically… I still have a few fade-outs but today’s reception was light years better than yesterday’s. I had repositioned the antenna yesterday eve….

      Rick and (Pete): First off I see your reception was over 10 min of coverage? where are you located? Did it pass over you? I had about 6 minutes today but the sat wasn’t overhead it’s to the west some. I think I’m honing in on a good position though!! 10 min is great!!!! Just wow I should just build an antenna like you but I wanna try it with this one, the USB cable is ordered, it’s 30 ft with an active repeater. I hope it has enough power for the dongle.

      I will get to building this pre-amp the first chance I get. Do either of you have a picture with the preamp assembled? How did you hook it up to the antenna (what kind of wiring, I assume coax soldered into the board?) I’m going to run antenna->pre-amp->dongle, but not sure where to place everything.. I might try and make a box with everything in it!

      Rick: The Amigos Viewer is really easy. Use the satellite simulation option (or other method) to give you a time of day when the satellite passes your area of interest. For example:

      This morning M1 came in range about 14:18 UTC of North America. From there I look at the history of amigos using this link to find where someone started receiving (and sending to Amigos server):

      I see that «Rick» (hmm wonder who that could be 😛 ) started receiving this morning at 14:21:40 and then Luc, 709xxxxx, and ME! followed. I put in the time into Amigos viewer: 14:21:00 and it starts checking the server for every 10 seconds of data each second.

      If it says «transfer aborted» it simply means there was no file with data at that time interval. So it will check 14:21:00, 14:21:10, 14:21:20 and so on. When it starts receiving files it will say «transfer complete» and you should see the three channels start to fill.

      When it’s done it will just stop automatically. Press «StopandSave» and then go to the «Images» folder in Amigos directory and voila!! A folder should be in there with the date and time stamp of when you COLLECTED this data, and inside of that folder is the data with pictures timestamped from the start of the satellite pass begin time you chose.

      So go ahead. Go into Amigos Viewer-> Type Start-> Set the date to 01/28 (remember UTC date of pass) -> Set time of pass 14:21:00 (UTC again). Let er’ RIP!!!! Bask in the beauty of our planet thanks to our signals combined, and mostly the Russian space program + Oleg + Vasili, etc, etc. I will remember these years for the rest of my life. Never have I participated in such a great program. I feel like I am part of a large community of enthusiasts like me. It makes me feel like life is great and actually picks my spirit up to see the images of our beautiful earth, and know that all of us across the world have contributed in some way or another to make it possible, in brotherhood!!!

      1. Rick

        Thanks so much Blackbolt,

        I’m having trouble connecting with AMIGOS at the moment, but I’m sure that problem will resolve on it’s own. I’m located near Manchester, NH — Google will show you. I appreciate your strong passion for this work! It is indeed satisfying to both see the Earth below in great detail, and to be part of a community of enthusiasts. I’m sure I will have plenty of questions for you and the group. Good luck with the preamp construction (short leads and in-line construction!).


      2. Pete

        Hi Blackbolt,

        Yes I’m very serious. The 25 to 30 dB is when the sat is directly overhead.

        I have sent Rick more stuff for you, and asked if he would be so kind as to post in his dropbox.

        Experimentation is the name of the game.

        Have FUN — Pete

          1. Rick

            Having trouble getting the Meteor Demodulator plug-in to lock. Had a very good pass this morning with a good strong 20 dB SNR but the demodulator just would not lock. PLL bandwidth set at 200. RF set to 137.09968. I recorded the baseband signal also, and LrptEX had no problem demodulating the signal. Here’s the image:


            Any ideas out there? Oh, and it seems intermittent; yesterday it worked fine and a decent image automatically posted to AMIGOS.


        1. Blackbolt

          Thank you Pete the info is terrific. Thank you for posting it Rick. Looks fun. Rick do you use a preamp too. For some reason I woke this morning to find the noise floor at -43dB. It is normally — 48-52 ….I bet I checked the antenna this morning everything was in order… There was even a signal a hill in the middle that was moving around on the fft.

          Rick-how is your PC clock being synced up? Lrptrx searches for the carrier but the Meteor plugin needs very accurate time so that the tracking frequency being fed to it is also accurate. You will not get a lock of the time is off!!

          1. Rick

            Thanks for reply. I run NTP, so my clock should be okay, but that could explain it for sure. I’ll look into that. Yes, I do have a preamp right up at the double-cross (see previous photo). I have a very long feed line back to where my PC is located, so the preamp is essential).


  24. Rick

    Checked clock with ntpq -p, and it looks okay to me, but still no demodulator lock. Blackbolt -How do you keep your clock synched? Here’s a screen shot of a bunch of windows, including the ntpq info at the bottom:

    Had a nice pass to my west with M1 rolled over such that its antenna pointed toward me (helped with Topaz Clarity! Thanks Pete!!). It’s demodulated by LrptEX:

    I sure would like to be able to share these on AMIGOS. Maybe I should reinstall everything…the setup seems to work for lot of people.


    1. Blackbolt

      Rick- I see two things different from mine. #1 is huge:

      1.) The biggest issue I am seeing is your tracking frequency being sent and where it’s trying to lock… It’s way off! It must be off because the tracking frequency being sent is off. If your time is right then:: Did you make the change to your satellite program to reflect 137.0968MHz for Meteor M1?!! If not this is where your problem is. Remember it sends the tracking frequency with doppler correction so the base frequency has to be correct.

      2.) Your demodulation is set on OQPSK, and mine is on QPSK, however it «locks» for me on either setting.. but worth a try just to make sure.


    2. Blackbolt

      Rick!! I see you got some nice passes in this morning. Did you figure it out or was it just luck again? Did you see my reply above? I am almost sure that is what your problem is except I cannot see your Satellite tracking program to be sure in the picture. Seems like it though based on tracking freq. being sent!

      Anyways, my reception this morning was absolutely abysmal — 7dB max. Right now M1 passes are BETWEEN me since I am in Louisiana, it’s either far east or west , hah! I’m waiting for my 10m USB cable to come in so I can run it all the way up somehow… but this Antenna just doesn’t perform like I want so I might try and rebuilt it today, not sure yet. Thinking of using a copper pipe but I don’t have mandrel. Might go back to my COAX design.. I’m so torn. 8 gauge copper wire just isn’t working, OR SOMETHING idk 🙁 I also thought of making it skinnier but the sensitivity of the antenna is worse than my all coax design by a lot, I am even tempted to put that back up , lol.

      1. Rick

        Hey Blackbolt,

        Yes. See my earlier reply below. Working great now — just want to get the RBG images saved off someplace. Also, look at the image I posted here a day or two ago — very cool because M1 is tilted and you can look out over the east coast to the horizon in the distance. Rotate the image so the horizon is horizontal.


        1. Blackbolt

          Glad you got it working! I see you’re part of Amigos now 🙂 I am thankful that you and a few others are adding your signal in.. Or I would not get any of North America zone until it’s on top of me (because m1 is damaged), and i’m at the bottom of U.S.A.

          Today I rebuilt my antenna and made the following changes:
          1.) RF Choke style to Infinite Balun style (used coax for one of the elements — a lot of work !)
          2.) Redesigned element routing at the top so I could trim the elements to more precise lengths. Before I had an extra 2-3″ because of the way the wiring came up to the top to make connections. Everything is close to exact spec now instead of a few inches over.
          3.) In the process of the RF choke windings at the top, I was able to use the extra coax length to remove an extension I had and go straight to the dongle from the Antenna. Shaved off around 16 ft. of coax. Just that alone has to be worth something?!!

          1. Rick

            Glad you are rebuilding your antenna — best part of this endeavor is making the best antenna in my view! I think the infinite balun concept is great — taking advantage of the skin-effect of the coax shield is amazing to me.

            I can still use some help with AMIGOS — when I manage to bring in images, they are «banded», i.e. missing data at regular intervals. I saw a post from you describing the same problem you had, and you theorized that the query rate was faster than the download rate (something like that). How did you resolve that?

            Also, I want to generate local RGB images so I can enhance them, but I don’t see a way to save them locally. I’m okay with saving a .wav file, but there does not seem to be a way to start «record on» and «record off» in the SDR# scheduler, triggered by Orbitron. Any insights?

            Any chance we could correspond by email? I’m at


    1. Blackbolt

      2XaK Meteor-M N2 is turned off indefinitely at the request of meteorologists due to a technical issue with the IR and LRPT. As long as M1 is making it’s rounds, they feel this is enough. Have you checked out M1 signal? It’s wonderful 🙂

  25. Rick

    Can anyone using NTP to synch their computer clock, and who uses the Meteor Demodulator plug-in for SDR# tell me what kind of accuracy they get (delay, offset, jitter) when executing ntpq -p at the command prompt? Thanks!


    1. Blackbolt

      Rick I replied with values of my ntpq -p outputs, your times seem fine. See above reply to your other post, I think I figured out your problem!!

      1. Blackbolt

        What I mean is I replied with the output but the comment went into oblivion, however I do not think the time sync is your issue.. again please see above reply with picture and #1 comment. I bet it’s #1. Really bet!!

        1. Rick

          Hey Blackbolt,

          You got it! Last night I recalibrate the dongle frequency against some NOAA broadcasts up around 160 MHz — it was way off. This morning I got two good passes while I was sleeping! Next thing I want to do is to get the RBG images to get saved; my other version of LRPTofflineDecoder did that, but the one configured for AMIGOS does not.


          1. Blackbolt

            when you find out how let me know. I have mine on RGB=yes but it still doesn’t output them….

  26. Rick

    Anyone out there have any experience with the 12 bit SDRplay unit? I just bought one but although it seems to be a fine receiver, all of my SDR# scheduler commands (e.g. radio_Start) triggered from Orbitron no longer work. So I had a great automated setup with my old RTL-SDR dongle that is now broken! Only other 12 bit choice is the one from Airspy, but it’s too expensive.


    1. Pete

      Hello Simon,

      From my observations, there definitely is a norrowing of the band width. I usually set BW to 115khz but on the last pass this morning (14 Feb) here in SOuth Africa, I set my BW at 100 khz. The captured image has the same quality but I have noticed that the constellation diagram is a lot more noisy and lock is lost sooner.

          1. Pete

            Another observation is that the constellation diagram is no longer a collection of 4 distinct round «dots». The pattern has changed to an elongated configuration.

            The signal strength appears to be less as well. I used to get a SNR of 25+ in SDR#, now the best I achieve is SNR of 20. LNA/Mixer/VGA gain setting have not been changed either. I still use the modfied driver with decimation 8 and sample rate of 1.4 MSPS

    2. Blackbolt

      2 days ago I switched to a laptop to try and capture Meteor-M N1 passes. I have not been able to get a lock (the laptop is too slow for SDRSharp). In the midst of that I noticed the bandwidth seemed very narrow. I sent an IQ file to the laptop from the desktop and there is a huge difference in the bandwidth like you guys are mentioning!!

      I switched back to the desktop this morning and waiting for a pass. We shall see if the narrowing persists but I think soon M2 might have to be turned on if M1 dies 🙁 I hope it don’t though. I love the RGB color I get from it and also enjoy when it rotates a little to see space. It’s beautiful.

  27. Rick

    I’m also seeing some degradation in signal quality. It’s hard for me to tell because I have also been changing my system around a bit. It’s also difficult to draw correct conclusions with this thing because there are so many variables — each pass is different, the satellite rolls in its orbit, and in my case, I get intermittent power-line noise (a bad power pole somewhere near me).


  28. Pete

    Thought I would share my recent success with M1. I downloaded the latest SDR# ver 1433 and loaded the mod plug-in “modrtlsdr” which gives 3 gain settings and decimation.

    I also reverted to my 820T2 dongle. Found the 820T unit a bit noisy. The 820T2 is reported as having at least 5 dB less noise. Also reconfigured my home brew amp and put in a variable resister (source to ground) to adjust the drawn current to 10mA. According to sources the BF981 works best and has it’s lowest noise with a current of 10mA. There is a strong indication that “noise” plays a major role in this game. As you can see from the image, the noise floor is low at -65. When I connect my amp it sits at -60.

    I setup SDR according to the attached pic. Found that the signal was much better than previous. The band width is still narrow at about 90 kHz, but I used a setting of 100 kHz. Lock of the signal is still slower but stays locked for longer. The constellation diagram was also much cleaner.

    For Rick, As I don’t have the means to post images on this forum, could you please post the settings I sent you together with my image. Maybe useful for some!!!!.


  29. Pete

    This mornings M1 pass (19 Feb) was quite a surprise. The bandwidth has changed (approx 110khz) and singnal quality much improved. The constellation diagram was quite clean. Managed a 8 minute capture with just a few «lines» spoiling the image at the very end. Used «InPaint» to remove the lines.

    Capture frequency used was 137.0960 Mhz. Adjusted the BW on the fly from 100kHz to 115kHz.

    Also made some very small changes to lrptRx. Carrier loop, under Lead man T changed Lead exp to 16. Symbol Loop, under Lead man T changed Lead exp to 15. This seems to help with stability and longer lock. Maybebe worth while playing with these settings???. Only SMALL ajustments will be tolerated by the software.


    1. Simon

      M1 signal is back to normal (strong signal in descending part of the pass), indeed. I am receiving it right now (06:30 UTC) and the signal width is definitely back to normal (110 khz). I posted the received image (satellite was up to 30° above eastern horizon) in Gallery section.

  30. Pete

    Have been playing with settings to lrptRx.
    Carrier loop, under Lead man T changed Lead exp to 16.
    Symbol Loop, under Lead man T changed Lead exp to 15.
    This seems to help with stability and longer lock. This definitely appears to work. Any one else tried this???

    1. Pete

      Hi Cees,

      I have tried but for some reason the QPSK demodulator does not seem to work with SDR#1434. When I click demodulator, the sound on my laptop mutes and when I click start, no data is recorded. The diagram is blank. Do you have any suggestions.


      1. Blackbolt

        The sound muting is normal. You do not need audio from the sound card for the decode….

        Can you take a screenshot and post it here of SDRSharp and any relevant settings?

  31. Cees

    Hi Pete
    The 1434 is not the reason.I receive the signal with the 1426.
    Most importantly is Orbitron with driver program Mydde.
    If this is installed then the Demolator starts automatically and writes the file to the lrpt-decoder.
    He builds the image during the transition.
    Please read the how to from happysat and do this step by step.

  32. Blackbolt

    NO Signal on Meteor-M N1 starting around 14:10 UTC 20-03-2016

    !! Not sure if it’s blank or what. I checked my pass, no data has been received for the last few hours!

  33. Cees

    Right, just had a message from Happysat that the M1 is off.
    Happysat have the information from Vaseli out Russia.
    It is waiting for the M-N2,end off this year (maybe)

  34. Rick

    I had two passes this morning with great signal, but the satellite is tumbling out of control. The images are pretty cool — you see the the Earth, the horizon, then the Sun! But it is very, very sad that this may be the end of it. We all worked so hard to receive that satellite, others worked so hard to build AMIGOS.


  35. Rick

    Here is the first pass I could find that shows trouble — it starts to roll one way, then tries to correct itself:

    Then here is what I think is the last pass before it was shut off — Sun, then the horizon moves in, then the Earth below:

    And this is the best one I ever got. I even framed it and it’s hanging on my wall!

    So sorry to see this go.


  36. Blackbolt

    The last non-rotated signal received was at 00:46 UTC March 20th. 2016.

    The beginning of it’s out of control spin was recorded by Me and then Rick on a northbound pass AT NIGHT TIME (about 9pm central USA time) !! This was at 02:00 UTC March 20th. 2016!! First it passed me and then Rick north of me..

    Here is the image at NIGHT showing a sideways view of the earth with light on one side (in the black and whites the earth in darkness is visible at the edge of the light)

    Very very sad about this. I left my PC on every single night, started all of the programs before turning in each night, so in the morning I could take part in this awesome effort to capture this satellite daily and nightly! Out of habit those programs are running right now even though in the morning there will be no Meteor-M N1 🙁 Each day I looked forward to a new and interesting image. I hope somehow it comes back I really do, I wish it wouldn’t be turned off.. who knows it may come back?!!!!!!! One can only hope!

    So around 1:00-2:00 UTC March 20th 2016 is when Meteor-M N1 lost control most likely when it passed a pole of the earth.

  37. ROBONUKA Автор записи

    Dear friends!
    M1 and M2 are turned off now . We hope that M1 will soon be fixed. We look forward to the transfer of LRPT data M2. In the next two years it is planned to launch same LRPT two satellites. AMIGOS project is not closed.
    Stan 73

  38. Blackbolt

    Thanks for the info!! I wish they would use 137.100 because for me, 137.900 has a 14dB signal at 137.912 which is within the bandwidth. Not sure what it is though. I’m hoping it will not affect reception of M2 on 137.900.

    Either way I am grateful for all of the efforts! Have a great week!

    1. Blackbolt

      Yes this is what I was getting but the sat elevation was max 20, but the signal was very strong considering! I am thrilled and looking forward to reception when they turn on the imaging portion of the satellite because right now that looks similiar to a «blank» signal except yes the spectrum looks really funky!! 🙂

  39. Pete

    M2 at 22h15 UTC 21 March 2016 — South Africa. Elevation 23 deg west pass. Good signal (Max 21 SNR on SDR#). Lock of signal good with a nice clean constellation diagram. Good clean IR image. Managed a clean 9 minute image with no lines. Am absoltely delighted to have M2 back. Thank you Rabonuka. Lets hope it behaves it self.

    Pete (Scottburgh — South Africa)

  40. Blackbolt

    You all have come through for us again! Thank you for all of your work 🙂

    I will miss the 3 visible channels of M1 but we will gain an infrared to see at night with M2.

    Hopefully M1 will stop spinning and we can have both 🙂

  41. Blackbolt

    Does anyone know how M2 compares to M1 signal wise? I know M1 antenna was damaged causing a weak signal on the leading edge of the satellite, but when it would PASS the receiving station the signal would pick up.. but is M2 stronger than M1 in transmitter power?

    I don’t have a base of reference because when I captured M2 last year or so I lived in a different place with a wide open field and clear view of almost all directions. When I moved to my place now, I got back into this only to find M2 was shut off, and was trying to receive M2 (I didn’t know it was shut off) and was picking up M1 instead!! Tomorrow will be the first time ever I will receive M2 from this new location. I am anxious!

  42. Blackbolt

    Tonight I am waiting for the overhead pass but while waiting Meteor-M N2 passed west northbound at 1:44 UTC, the faint signal I got looked like solid bars as if the data being sent is blank!! Dear Russia please check M2 when you wake up (it’s 5am now for you all) to see if the Data is blank.

    The next pass is in an hour or so I should be able to provide a screenshot of the signal.

    Thank You. (You know I watch this thing like a hawk :P)

    1. Pete

      Hello Blackbolt,

      When I was receiving M1 right up to when it failed the signal was reasonably good. — SNR on SDR# 15 to 18 at peak. Last night got my 1st image from M2 with SNR at 18 to 21at peak. Elevation was only 23 deg west

      M2 signal is defitely stronger than M1.

      Because I live in a retirement village, I can’t put up a permanent antenna. Too many old farts around who complain. My QFH is mounted just above gutter height (about 3 meters — 9 feet) off the ground. I have made it «portable» and light so that I can mount it easily and remove it after a satellite pass.

      Hope this helps


      1. Blackbolt

        I am looking forward to today’s pass. It will be right overhead!!

        The best signal I received with m1 I believe was 13-14dB ( with no decimation! ), and the best at my old home with m2 from a file I just played was 16-17dB. Yesterday I got 15dB on a west pass with 40 degree elevation max. Today at this new place if I can achieve my old signal levels where I used to live, 16-17dB I will be thrilled.

        The signal you and Rick tell me are always really high, but I am sure at this point it’s not because of your setup is better per say, but because you are using decimation. Using decimation shows up as a higher signal (but really is not!). When I receive, SDRSharp is on 1.024Msps. I do not use decimation.

        I’m going to link 2 pics RIGHT NOW of a steady signal to illustrate what I mean.
        Here you go:
        1.4Msps no decimation 1st screenshot = 12dB!!
        1.4Msps with 4x decimation 2nd screenshot = 17dB!!

        So just by decimating it appears to give a gain of 5dB, but in my research it is a false gain and decimating doesn’t actually help. The only thing it really is doing is changing what is SEEN on the FFT and waterfall according to the people who develop SDR Sharp.

        1. Pete

          Hi Blackbolt,

          You are spot on with your comments on decimation.
          But I have read that decimation improves the Signal to Noise Ratio. My understanding of this is that the signal above the floor noise appears higher. A lower noise floor translates to improved signal. I’m not an expert in this field, I may have the wrong end of the stick — Ha Ha.


          1. Blackbolt

            Let me clear it up for you Pete.

            The coding in the original drivers of SDRSharp already decimate automatically to receive the best possible signal to noise ratio!!

            These new modded drivers are allowing you control over the VISUAL aspect of the signal alone.

            As I stated, there is no actual improvement on the received signal because regardless of the decimation you select with this mod, the software is still going to process the signal the same way it always has so the true signal will not change!!

            I’ve personally tested this on many signals to see if it would bring in the «audible» signal to be any clearer and there was NO CHANGE when changing the decimation, only visually it appeared to be ‘better’. They did go onto say if it will allow you to use higher samples per second, then use it as that WILL improve the SNR.

            To quote the information:

            ‘Update: It turns out that decimation is already used in the existing SDR# code, so using decimation in the new driver won’t improve the real SNR, only the visible SNR – so there will be no audible improvement. It will however allow you to effectively zoom in on the spectrum without loosing visible resolution. Also it allows you to use a higher sample rate (2.8 MSPS) which will improve SNR, whilst maintaining a reasonably sized (small enough) visible bandwidth for narrowband signals.»


          2. Blackbolt

            Let me use an example to illustrate:

            A signal is present at 137.000 Mhz. The IF is tuned 50khz.

            Non-modded driver:
            Sample rate=1.4MSPS
            Visual (FFT and waterfall) Sample rate = 1.4MSPS
            Actual signal sample rate: (IFx2*nyquist) = 100khz ( EXAMPLE NUMBER ONLY )
            Modded driver with gain controls etc:
            Sample rate=1.4MSPS, Decimation rate=4 (so 280khz visible with this driver)
            Visual (FFT and waterfall) Sample rate = 280khz!!
            Actual signal sample rate: (IFx2*nyquist) = 100khz ( EXAMPLE NUMBER ONLY )

            So you are only changing the sample rate of the visible spectrum by decimating with this driver, because the signal processing coding was not changed and already does the best job possible automatically!!

  43. Pete

    Hi Blackbolt,

    Many thanks for taking time to clarify the decimation «saga». Much appreciated.
    As a matter of interest, I do use the modded driver which allows decimation. I use 1.4 MSPS and decimation 8 with a bandwidth of 115kHz. I open the reorded IQ wav file with LrptRx.exe and process it maunally. This works well for me and I get a pretty clean image.


      1. Rick

        Thank you! I see some beautiful images there, and they are in color! How can I see colors like that at my station? What I get (this is from my pass this morning) is this:

        This is the case for both the images saved by M2_LRPT_Decoder during a pass, and for images saved from AmigoViewer.

        My M1 RGB images looked great, so I’m guessing that my AmigosViewer software or M2_LRPT_Decoder software needs to be updated? I am getting a very good signal and I would like to also see those great RGB color images.


  44. ROBONUKA Автор записи

    Hi Rick!
    Change settings in the ini-file of M2_LRPT_Decoder.
    Change all 123 to 125 (or 122).
    For example:


    Use SmoothMeteor soft to convert 125 (red and blue) file into 122-image or other colors.
    Now M2 transmits data 1(64).2(65) and 5(68-IR) channels and we can get 125-file, but once a month for one or two days the settings will be changed to 123 like M1.
    Earlier I gave you the link about the black lines M2. Look at the conversation me and Simon.

    Best regards,
    Stan 73

  45. Blackbolt

    No reception from M2 today? Last Amigos history shows UTC 27.04.2016 at 12:12. Luc only received 1 minute of data and it stopped?

  46. Angel Sevov

    can someone help me? since 23rd of april im geting white blank images, M2_LRPT_Decoder works good, im seeing live real data but when M2_LRPT_Decoder saves the image its not saving to path that i choosed instaed it saves in the path where M2_LRPT_Decoder is. my settings seems ok, i checked it like 4-5 times.. and the other interesting thing is that i saved ini file with values 125 and after every pass turns values to [FAST] FORMAT=jpg R=1 G=2 B=3






  47. Simon

    Yesterday M2 was transmitting in 1-2-3 mode. My LRPT decoder (AMIGOS) was set to combine imegas in 1-2-2 mode as usually. It would be really useful if the satellite could be set so that it transmits in 1-2-3 mode for example on 10th day of the Month (as it was yesterday). In that case I could programme the decoder (via DDE client batch file) to start in 1-2-3 mode on the 10th day of the month and get the nice full color image automaticaly. Maybe I am not aware but there already exist a schedule for when M2 is transmitting in 1-2-3 mode?

  48. ROBONUKA Автор записи

    to Angel Sevov :
    Notice the «_» symbol is a comment
    to Simon:
    The exact schedule does not exist. Typically, the first Monday of the month.
    Stanislav 73

  49. ROBONUKA Автор записи

    It’s OK!
    Press Ctrl+F5.
    Доступ есть, если страница не загружается, одновременно нажмите клавиши Ctrl и F5.

  50. saleev

    С прошлой недели нет данных в АМИГОС, статистика за сутки либо не открывается, либо пустая. картинка на компе сохраняется.

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