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

[Craig Kief]

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
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-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf
Of Patrik Tast
Sent: Tuesday, December 08, 2009 3:32 AM
To: Alexandru Csete; address@hidden
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" <address@hidden>
To: <address@hidden>
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 <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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>>
>>
>>
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