[amsat-bb] Re: Satellite's

Mark L. Hammond marklhammond at gmail.com
Wed Aug 29 11:43:15 PDT 2012


This is ALMOST what you want to do or describe.  You're a clever guy..maybe you can put them together to do what you want :)




Mwark N8MH 

At 10:47 AM 8/29/2012 -0500, you wrote:
>Hi Mike,
>I have two radios that have a built in panadapter and have used the
>dongle as a stand alone panadapter. The problem is all the panadapters
>I have used or read about, other than SDR based gear like the Flex
>radios, do not have a connection between the panadapter and the
>frequency control of the radio. With an SDR receiver you click on the
>waterfall or spectrum display and the radio is tuned to that
>frequency. That is what I am trying to do and that bit you get for
>free with an SDR receiver the hard the part I am trying to solve is
>controlling the transmit frequency (including doppler correction and
>offset) when using linear sats. The only way I have been able to do
>this so far is to use SDR-Radio with its built in doppler correction
>for the receiver and my IC-7000 as a transmitter under the doppler
>corrected frequency control of SatPC32. This works but changing the
>frequency on the SDR does not adjust the transmit freq. I am hoping
>someone has actually done this as I have never been a big fan of
>reinventing the wheel.
>The FT-817 is a very cool rig and I will be very interested to see how
>you control the FT-817 frequency from the panadapter - that is the
>tricky bit since the panadapter does not have to even know what
>frequency you are receiving. It should be possible to poll the
>panadapter for the offset of the frequency you have clicked on and add
>that to the FT-817 frequency and feed it back into the FT-817.   I am
>sure you guys have come up with something. Thanks for writing the
>article. I look forward to reading it.
>73 W9KE Tom Doyle
>On Wed, Aug 29, 2012 at 9:18 AM, Mike Seguin N1JEZ
><n1jez at burlingtontelecom.net> wrote:
>> Hi Tom,
>> There will be an article coming up in the AMSAT Journal on work that W1GHZ,
>> W1FKF and I have done on tapping the common IF in the FT-817 and using the
>> FunCube as a Panadapter. Our primary application is weak signal microwave.
>> I would think it would work well for satellite. That way your software would
>> be controlling an FT-817. The common IF is centered on 68.33 MHz in the
>> FT-817, so you see +/- 40 kHz around that. You would be able to take
>> advantage of all the front end filtering in the FT-817.
>> 73,
>> Mike, N1JEZ
>> AMSAT 29649
>> "A closed mouth gathers no feet"
>> ----- Original Message ----- From: "Thomas Doyle" <tomdoyle1948 at gmail.com>
>> Subject: [amsat-bb] Re: Satellite's
>>> I am close to a SatPC32 <-> dongle system but there is probably
>>> someone with a much better 'simple' or even a 'very simple' solution.
>>> I would be very interested in hearing from anyone who has actually
>>> achieved fully synchronized doppler corrected transmit control with a
>>> dongle for the receiver. A reply offline would be best to prevent
>>> flames.
>Sent from my computer.
>tom ...
>Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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