[amsat-bb] Scott's Igate

Scott scott23192 at gmail.com
Tue Sep 19 05:01:16 UTC 2017

Thanks a million for the info, Roy!

Never ceases to amaze me how much you can learn from people who have been
doing this for a while.



On Mon, Sep 18, 2017 at 4:57 PM, Roy Dean <royldean at gmail.com> wrote:

> >
> > Dopler shift
> > APRS-IS is throwing away your packets Andrew
> Andrew, it is NOT doppler shift.   That has nothing to do with Scott's
> question.
> Scott, the reason is because Direwolf required one flipped bit to fully
> decode the packet (ie, it didn't "hear" the correct bits, but tried
> flipping each single bit until what it decoded passed the checksum).   That
> "[SINGLE]" means that it swapped a single bit to get a correct checksum.
> Direwolf WILL NOT pass ANY packets on to the APRS-IS unless it completely
> decodes the packet correctly (ie, that section should say [NONE], as in "no
> bits were flipped in order to get the checksum to work).
> Hope that makes sense.
> --Roy
> >* On 19 Sep 2017, at 5:45 am, Scott <scott23192 at gmail.com <
> http://www.amsat.org/mailman/listinfo/amsat-bb>> wrote:
> *> >* Hi everyone.
> *> >* I've been trying to improve the effectiveness of the SDR iGate that
> I have
> *>* listening on 145.825 and am finally seeing more packets.
> *> >* Since duplicates don't show up on ariss.net <http://ariss.net>,
> that explains why not all my
> *>* received packets show up on the website.  Just for my own education,
> I'll
> *>* often compare what my iGate receives from the ISS or PSAT to what
> shows up
> *>* on ariss.net <http://ariss.net> to verify that mine are in fact
> duplicates.
> *> >* Today on a PSAT pass I noticed that one of my received packets was a
> *>* duplicate (which is fine) but the other packet that I received was
> also NOT
> *>* on the website.  So, now we're not talking about a duplicate - it
> didn't
> *>* get accepted to the site for some other reason.
> *> >* Here's the packet as I received it.  I'm guessing that the issue
> is that it
> *>* wasn't digipeated by a station ID of "ARISS*", but I'd like to know for
> *>* sure.  If anyone is really good with APRS in general or the APRS sat
> *>* digipeaters in particular, I sure would appreciate hearing from you.*

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