Patrik and Alex, You mentioned "an OSCAR" in the mail listing. Does this mean A0-51? Also, you mention the TVRX. Why is this important vs what I have? Craig
Craig J. Kief Deputy Director [email protected] 505.934.1861 cell (preferred) 505.242.0339 office 2350 Alamo Avenue SE, Ste. 100 Albuquerque, NM 87106 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Patrik Tast Sent: Tuesday, December 08, 2009 3:32 AM To: Alexandru Csete; [email protected] Subject: Re: Fw: [Discuss-gnuradio] AO-51 and GRC Hi Alex, I used a 1.2 m long X-yagi and a cheap broadband TV pre-amp http://www.vekoy.com/product_info.php?cPath=85_402&products_id=12828 EZNEC told me I should get ~14 dB Gain with this gadget, It sure works! The boom is a PVC pipe and elements are 3.2 mm Al/Ag TIG welding rods, < $20 An image of the antenna and txt how I made the X-Yagi is at http://www.poes-weather.com/~patrik/AO-51/ It is tricky to follow the downlink frequency change due to doppler.... Patrik ----- Original Message ----- From: "Alexandru Csete" <[email protected]> To: <[email protected]> Sent: Tuesday, December 08, 2009 12:02 Subject: Re: Fw: [Discuss-gnuradio] AO-51 and GRC > 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 _______________________________________________ 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
