Posts by dm4im

    I got it to work for users over the internet. Place // before if(useCAT && memcmp(cli,"192.168",7))

    // if(useCAT && memcmp(cli,"192.168",7))

    Now internet users can qsy , BUT: If someone clicks on the Icom-Cat, the program tries to open a USB-Port and if it finds none, it will do that forever . Internet users can no longer qsy until the program ist restarted by hand. The software is not usable for remote access as it is now. But i think it wasn't DJ0ABR's intention to provide another WEB-SDR software, right?

    Hi there.

    I just wonder why so many stations crank up their microfones to the max. and apply a lot of compression. C'mon guys, you are not working 2m DX with signals barely readable and just above the noise floor, you are working through a repeater. The guy on the other end of the globe hears you just as loud as you do.

    If the station you are talking to has shitty audio, please have the guts to tell him so. Don't report "excellent signal", "beautiful audio" , when it obviously is NOT. Dare to give a report other than Q5 if you have a problem to comfortably read your partner. I'm not talking about overdriven amps, that is a whole different story.

    To top this off, some operators use desktop microfones, lean back and sermonize. This applies echo to the signal and i wonder if they have ever listened to their own signal. Do they really think this makes their audio more pleasant or easier to copy? I does not.

    Flame suit on, you can reply directly to mycall at t minus if your reply is not appropriate for a public forum ;)


    have some trouble with the software. Neither Chromium nor Firefox nor slimjet on linux can change the rx-qrg by clicking on a signal or with the mousewheel. Only Microsoft Edge on a win10 PC seems to work. At least in local network. Asked a friend to try over the internet with his windows pc. He used Firefox, Chrome and Edge, but could not change rx-qrg either. Any hints?

    73, Martin

    M1CTK First, please DO NOT copy & paste the entire conversation again and again. This is confusing and will blow things up.

    Second, please DO give some more information about what goes wrong and what you have done so far. Screenshots are always great. Thanks

    M1CTK. You need 14V for the narrowband Transponder or 18V for the wideband.

    If you can't supply 18V, just rotate your LNB 90°. You will still receive narrow band signals, but attenuated, because this way you changed polarisation. The wideband transponder should now be visible on sdr console. Fully zoom out to see the transponder over the noisefloor. Also, check the tilt angle you need for your location for max. signal level. There are calculators for azimuth, elevation and skew (tilt) to be found on the web.


    20-25dB over the noise is good. How strong is the upper beacon?

    I see different levels when i compare gqrx and sdr-console, both getting their data from the same sdr dongle on a server running rtl_tcp. In gqrx, the lower beacon is 30-35dB over noise (when tx-ing the steady carrier) , the upper beacon 27dB. In sdr-console, the lower beacon is only 15dB , the upper beacon 25dB over noise.

    Maybe it depends on the settings. Experiment with LNA-Gain etc. Compare weak signals with web-sdrs to evaluate your setup. I can read many weak signals better on my own setup than on .

    73, Martin

    Here's what i get now:


    I tried LNB -> 20mKoax -> Amsat RX-Mixer -> FT-290R2. The s-meter was pinned in the right corner and i mainly heard noise, only the strongest signals were readable. Much better with 20db-ish attenuation.

    Tried a different radio with better strong signal handling. No attenuation necessary. So it depends on your radio. If your radio has it, the ATTENUATOR is your friend.

    73, Martin

    I bought the Universal RX Mixer and assembled it/put it in an enclosure while at my /p location during an easter vacation. I would have liked to find a feed through capacitor in the kit. If you - like many here - are not well equipped with parts, you need to order one . Reichelt doesn't have them, Pollin does. So why not include one in the kit and therefore raise the price to -say- 179.00€ ?

    I sure would have paid that extra 50Cent. It saves an order.

    73, Martin


    Will use the raspberry image for portable operation from my vacation qth, and , most important, for a presentation at DL0WH to show how easy it is to get qrv. We have a bunch of raspberry enthusiasts there, but they somehow lost connection to "radio" in "amateur radio". Just now and for preparing the presentation, i receive the sat on your raspberry image with a 60cm dish behind a closed balcony door and with a tree in the path. Amazing

    But also will try to get it up and running on a desktop pc. Will report here. I'm an even worse programmer ;-)


    I'm running GQRX at home on a Desktop PC. Do you intend to make the source code available so every one can install this on their desktop PC, not only for the raspberry?

    Hi there,

    i tried to inflate with 2 different programs with GUI on a linux computer, both failed. Inflating on the commandline resulted in a file >5Gb. I copied it to the card anyway using dd , but it wouldn't boot. Downloaded it to my laptop and tried there successfully. It also resulted in a file >5Gb, but dd copied it and it would boot. Something is wrong with the file, i should say.

    Anyway, good job! Been trying to run my own installation on a 3b+ over the last few days and failed (audio device underruns) or had a huge cpu-load >78%. So your optimizations, if any , do the trick. Load only abt. 40%. Keep on!


    Today DJ8LC and me measured the re-built antenna according to .The match was a lot better and closer to the desired frequency. I didn't fix the patch to the reflector but only glued 2 spacers on the patch so i could rotate the patch while measuring. The place of the spacers have a great impact on the match. We rotated the patch until we got a return loss about 20dB on 2400Mhz. Then we placed the antenna in it's final box and measured again. 26dB.... Done!

    The antenna is placed in the lid of the box, the box presses the antenna down to the lid when screwed on. Now i need to seal the hole where the n-socket protrudes the lid. see some pictures and a HowTo

    Now desperately waiting for the transverter from LZ-Land. 73, Martin