QO-100 Linux SDR Transceiver

    Dear all,

    I haven't found many people on the air using Kurt's software, so I decided to bother you on this forum.

    I have been wondering whether my receive path is good enough. The signal levels I get with the AMSAT-DL software on the narrowband transponder with RX bandwidth = 2.7kHz are:

    • Lower beacon: 29dB (when there is no Morse).
    • Middle beacon: 22 to 23dB (0Hz centered on response null).
    • Upper beacon: 22 to 23dB (beacon centered on 2.7kHz receiver bandwidth).

    Are these numbers realistic or is my receiver deaf?

    Any replies or opinions would be most welcome. Thanks!

    Hallo,

    please have a look to this thread.

    Post
    RE: NB Transponder - Received Signal Level
    Hallo,
    please don't compare levels shown by the Console without looking to the zoom of the spectrum. The level is changing dramatically while zooming. The IS0GRB receiver shows approx. 18dB SNR of the beacons. It seems to be realistic. To compare dishes or receiving situations it's more useful to look to the basic noise floor of the transponder. If this is above the LNB noise all is ok. No further improvement is possible. It is good for dish adjustment also. Because of the unknown LNB gain,…
    DL5CN


    Don't care about beacons. Try to see the noise floor from the ransponder above the LNB noise.
    Use an RTL-Stick V3 and SDR# to have a spectrum. It is good for finding the satellite and dish adjustment also. The possible SNR of user signals and the beacons are referred to the transponders own noise. That's why reports like 59 are useless.
    73
    Andreas