Posts by dm4im

    Der Umbau eines LNB ist sicher erforderlich, ich würde mir aber nicht die Mühe machen, den TCXO im LNB unterzubringen.

    Auch hinsichtlich der Wiederverwendbarkeit. M.E. ist es besser, den TCXO in ein Weißblechgehäuse, mit F-Buchsen am Ein- und Ausgang, zu setzen. Wie das geht ist sicher wo beschrieben. Man braucht einen 3.3V Spannungsregler, einen Parallel- und einen Serienschwingkreis und ein paar Halbleiter wie Widerstand, C's etc. Und natürlich einen TCXO (Conner Winfield D75F (Digikey) ist empfehlenswert). Das Teil wird zwischen der Versorgungsspannung und dem LNB ins Kabel gesetzt. Im LNB sind minimum 3 Bauteile unterzubringen (2 Drosseln und 1 C). Selbst ich mit zwei elektronisch linken Händen und ohne großartige Grundkenntnisse konnte das bauen. Die Referenz kann somit im Shack bleiben und eingepackt in Schaumstoff oder Styropor driftet das kaum noch. Wird der LNB getauscht, bleibt die Referenz erhalten, ohne die Gefahr, beim Auslöten was zu grillen. So ein TCXO kostet etwa 13€ , ohne Fracht. Da überlegt man es sich, wo der hin kommt. Bei Interesse poste ich einen handgezeichneten Schaltplan meiner externen Referenz. Alles ohne Gewähr von einem elektronischen Laien.

    Hi Dave,

    find DL3DCW's Software here in the forum, maybe that is close to what you are looking for. Also find

    gqrx_settrx , a script that lets you qsy a tx and a (seperate) rx by clicking on the waterfall of gqrx. Not exactly what you are looking for, but close.

    73, Martin


    You marked 2 pads, i think it is the one closer to the RDA Chip. Inject your Reference there, test with a handheld Radio by transmitting on ~ 437.00 (*24 = 10489.2) and find the signal on your sdr program. If you find it, you picked the right pad.

    Just playing with the new version. Although equipped with an aluminum cooler/case, the pi4 gets very hot - the software is not to blame for this, from other experiments i knew it would get hot. I think a fan is mandatory.

    The performance is good , quick and the delay compared to the pi3b+ or even an analog rx is small. While i had some problems with crackling and interrupted audio on the p3b+ running the older version, this version for the pi4 runs smooth so far. Thumbs up!

    Hallo, bekomme eine deutsche Fehlermeldung beim Start von SDR-Console, mit der ich nichts anfangen kann, vlt. weiss jemand was das ist und wie man dem begegnet. Hello, i get an error in german language, therefore i write in german, sri..

    Error: Server ist ausgelastet Dieser Vorgang kann nicht ausgeführt werden, da die andere Anwendung aktiv ist. Klicken sie auf "Wechseln zu" um zu der anderen Anwendung zu wechseln und das Problem zu beheben.

    Wie so oft gibt Windows (10 hier) keine Auskunft, welche Anwendung das sein könnte und ich starte auf diesem Rechner nichts ausser SDR-Console. Kann sich jemand einen Reim drauf machen?

    Nach denm Klicken auf "Wechseln zu" öffnet sich das Startmenü von Win10 und das Fenster "Select Radio" der Console. Alles arbeitet normal, aber es nervt eben. Jemand?

    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