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

From: Alexandru Csete
Subject: Re: Fw: [Discuss-gnuradio] AO-51 and GRC
Date: Tue, 8 Dec 2009 11:02:47 +0100

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?



2009/12/8 Patrik Tast <address@hidden>:
> 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"
>> <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?
>>> 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
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