Re: [Discuss-gnuradio] Re: problem with tvrx , wbx and AO-51.

[naveen nischal]

Hi Guys,

I have been using the nbfm_receive but still don't get any voice from the AO-51,

although the setup works like a charm receiving from a ham-radio. i even tuned for the doppler shift which was supposed to be a few Khz but still get no results.

I am attaching the GRC i have been using please take a look at it and also a screenshot. i have a short coax so i have not been using a tv pre-amp. I cant guess what's wrong. I appreciate your help.

Thanks & Regards,

Naveen

--- On Tue, 8/6/10, Patrik Tast <address@hidden> wrote:

From: Patrik Tast <address@hidden>
Subject: Re: [Discuss-gnuradio] Re: problem with tvrx , wbx and AO-51.
To: address@hidden, "Patirck Strasser" <address@hidden>
Date: Tuesday, 8 June, 2010, 7:10 PM

Hi All,

I just recorded a 30 degree AO-51 pass over Western Finland using a 1.2 m RCP Yagi, USRP1, TVRX and TV pre-amp http://www.vekoy.com/product_info.php?cPath=85_402&products_id=12828

Audio file is located at http://noaaport.poes-weather.com:8081/AO-51/
At 1745Z Tuesday 8th next AO-51 pass will be 70 degrees, I'll record that one also.

Don't hesitate to ask questions,
Patrik


----- Original Message ----- From: "Patirck Strasser" <address@hidden>
To: <address@hidden>
Sent: Tuesday, June 08, 2010 12:50
Subject: [Discuss-gnuradio] Re: problem with tvrx , wbx and AO-51.


> schrieb naveen nischal am 2010-06-04 23:49:
>> Hi,
>>
>> I have recently got into doing the SDR, i have been using the both the
>> tvrx and wbx daughter boards for communicating with the ham radio at
>> 435.300Mhz. I am not too good at python so i use GRC. However when i try
>> to receive from the voice from the AO-51 satellite at the same 435.3Mhz
>> frequency i dont get anything. Any comments or suggestions are appreciated.
>
> Please take a look at
> http://www.amsat.org/amsat-new/satellites/status.php
>
> AO51 seems to work as a repeater/transverter, it never resends the input at the same frequency/band. Very common is to have the uplink on 2m=145MHz and the downlink on 70cm=435MHz. This is called V/U-mode. You can find details and the current status at the link above.
>
> Please also take Doppler shift into account, this is not big show-stopper at FM, but be prepared to retune sometimes. You will see the Doppler shift if you use a waterfall display.
>
> The easiest to start is to listen first. It's very probable that you will hear some conversation during a pass.
>
> Patrick
> -- Engineers motto: cheap, good, fast: choose any two
> QTH: JN77rb
> Patrick Strasser OE6PSE <oe6pse at wirklich priv at>
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio


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