[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Fw: [Discuss-gnuradio] AO-51 and GRC

From: Patrik Tast
Subject: Fw: [Discuss-gnuradio] AO-51 and GRC
Date: Tue, 8 Dec 2009 10:00:48 +0200

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


----- Original Message ----- From: "Alexandru Csete" <address@hidden>
To: <address@hidden>
Cc: <address@hidden>
Sent: Tuesday, December 08, 2009 3:57
Subject: Re: [Discuss-gnuradio] AO-51 and GRC

2009/12/8 Craig Kief <address@hidden>

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?


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.



Discuss-gnuradio mailing list

reply via email to

[Prev in Thread] Current Thread [Next in Thread]