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
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