[amsat-bb] APRStk ? Or other?

[Mike Thompson]

I wonder if it would be best to run 2 RTL's on a Rpi for use on both 144.39
and on UHF for the ISS, or is it just as effective to run one.

On Thu, Mar 2, 2017 at 10:08 AM, Scott <scott23192 at gmail.com> wrote:

> I was also concerned about that at first but on most passes I log a
> significant number of packet receptions, so while adjusting for RX doppler
> might help to some degree, it’s definitely not a deal-breaker.
>
> (I also learned not to judge your effectiveness by the number of packets
> you iGate to ariss.net; it appears that duplicates only show up once.
> So, to REALLY know how well you’re doing, check the log file on the iGate
> or use an external app to monitor it on another PC)
>
> -Scott
>
>
>
> ------------------------------------------------------------
> --------------------
>
>
> From: Mike Thompson
> Sent: Thursday, March 02, 2017 11:01 AM
> To: Scott
> Cc: amsat-bb at amsat.org
> Subject: Re: [amsat-bb] APRStk ? Or other?
>
> I wonder how hard it would be to get the raspberry pi to download TLE's
> every now and then, and apply doppler correction to the downlink iGate
> frequency. on 70cm, this might be a big deal.
>
> On Thu, Mar 2, 2017 at 9:56 AM, Scott <scott23192 at gmail.com> wrote:
>
>   Hey Dave.
>
>   It takes longer to read the instructions that it does to setup a
> Raspberry Pi to be an iGate.
>
>   When the ISS digipeater changed to 70cm, there were not enough iGates so
> I thought it might be fun to throw one together.  There are numerous
> how-to's online, but this one is perhaps the most straight-forward:
>
>   https://github.com/wb2osz/direwolf/blob/master/doc/
> Raspberry-Pi-SDR-IGate.pdf
>
>   ... unfortunately, the way the document was created you won't be able to
> copy/paste commands.  But regardless, it's not a difficult process if you
> have even the slightest familiarity with a Pi or linux in general.
>
>   Hope that helps!
>
>   -Scott,  K4KDR
>   Montpelier, VA  USA
>
>
>
>   ------------------------------------------------------------
> --------------------
>
>   -----Original Message----- From: Dave via AMSAT-BB
>   Sent: Thursday, March 02, 2017 9:57 AM
>   To: amsat-bb at amsat.org
>   Subject: [amsat-bb] APRStk ? Or other?
>
>   Hi All
>
>   I'm setting up an autonomous sat gate using a spare Kenwood TMD700. I
> seem to remember that once upon a time there was a DOS program called
> APRStk that could Doppler correct the TMD700.
>
>   Does anyone know of a more up to date alternative that would run on a Pi
> or Pi Zero?
>
>   Regards
>   Dave EI4HT / M0GIW
>
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