Hi Patrik, Thanks for the info. It's quite good reception you have with the TVRX. Did you use any low noise amplifier in front of the TVRX?
Cheers Alex 2009/12/8 Patrik Tast <[email protected]>: > Hi Alex & All, > > I use the usrp_nbfm_rcv.py in examples to listen on OSCAR. > Here is a sample audio recording I made a few week ago > http://www.poes-weather.com/~patrik/AO-51/ 3.6 mb > > Patrik > >> ----- Original Message ----- From: "Alexandru Csete" >> <[email protected]> >> To: <[email protected]> >> Cc: <[email protected]> >> Sent: Tuesday, December 08, 2009 3:57 >> Subject: Re: [Discuss-gnuradio] AO-51 and GRC >> >> >> 2009/12/8 Craig Kief <[email protected]> >>> >>> I need a little help. I want to do a project involving GRC. There is a >>> satellite called AO-51 (http://www.amsat.org/amsat-new/echo/). If you >>> >>> watch some of the youtube videos you will see what most folks are using >>> this satellite for. It is great for using HAM licenses to do >>> >>> audio repeaters. I want to do this >>> (http://www.youtube.com/watch?v=1HfvmU_utI8) with SDR. We have our ground >>> station set up where we use nova software to drive our G5500 >>> >>> rotators. We have a 144MHz antenna for TX and a 2.4GHz antenna for >>> receive. We have a USRP-1 with a BasicTX and DBSRX for transmit and receive. >>> We are using >>> >>> the GRC for our design work. What I want to do is be able to talk through >>> a microphone and listen with a pc speaker on the >>> >>> rx side. My problem is that I am very new to GRC and am not positive >>> about what blocks to use and what settings I should choose. >>> >>> Has anyone ever tried to do anything with AO-51 and GRC? >>> >>> Craig >> >> Hi Craig, >> >> I'm playing with GNU Radio and USRP for using it as ham radio >> transceiver, though I'm still learning. >> >> Since AO-51 is an FM satellite it is relatively easy to have a quick >> prototype up and running because there are already FM modulator and >> demodulator blocks available in GNU Radio and GRC. There are even >> examples for how to make FM transmitter and receiver in >> /usr/share/gnuradio/examples/usrp/ or >> /usr/share/gnuradio/examples/grc/usrp/ for GRC. For GRC I can only >> find wide band FM receiver example, but you can simply replace the >> wide band FM demodulator block with a narrow FM demodulator. >> >> I don't know how good DBSRX is above 2.4 GHz, I have only used it on >> 2.2 GHz where it works very well. Otherwise there is the RFX2400 for >> 2.3-2.9 GHz. Note the AO-51 is very often in V/U mode, i.e. uplink on >> 145 MHz and downlink on 435 MHz and the DBSRX will not cover that. >> >> Cheers >> >> Alex >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
