[Discuss-gnuradio] Re: problem with tvrx , wbx and AO-51.

[Patirck Strasser]

schrieb naveen nischal am 2010-06-04 23:49:
> Hi,
>
> I have recently got into doing the SDR, i have been using the both the
> tvrx and wbx daughter boards for communicating with the ham radio at
> 435.300Mhz. I am not too good at python so i use GRC. However when i try
> to receive from the voice from the AO-51 satellite at the same 435.3Mhz
> frequency i dont get anything. Any comments or suggestions are appreciated.

Please take a look at
http://www.amsat.org/amsat-new/satellites/status.php

AO51 seems to work as a repeater/transverter, it never resends the input 
at the same frequency/band. Very common is to have the uplink on 
2m=145MHz and the downlink on 70cm=435MHz. This is called V/U-mode. You 
can find details and the current status at the link above.

Please also take Doppler shift into account, this is not big 
show-stopper at FM, but be prepared to retune sometimes. You will see 
the Doppler shift if you use a waterfall display.

The easiest to start is to listen first. It's very probable that you 
will hear some conversation during a pass.

Patrick
--
Engineers motto: cheap, good, fast: choose any two
QTH: JN77rb
Patrick Strasser OE6PSE <oe6pse at wirklich priv at>