[amsat-bb] Help me understand my iGate?

Andrew Rich vk4tec at tech-software.net
Mon Sep 18 20:17:55 UTC 2017

Dopler shift

APRS-IS is throwing away your packets 


> On 19 Sep 2017, at 5:45 am, Scott <scott23192 at gmail.com> 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, 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 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.
> ---------------------------------------------------------------------------------
> Digipeater WIDE1 (probably PSAT) audio level = 77(8/8)   [SINGLE]
> :::::____
> [0.2] N2PYS-3>T2PX4Z,PSAT,WIDE1*,WIDE2-2:`lZ!l <0x1c>K\]=<0x0d>
> MIC-E, Kenwood HT (W), Kenwood TM-D710, In Service
> N 42 08.4000, W 080 02.0500, 0 MPH
> ----------------------------------------------------------------------------------
> 73!
> -Scott,  K4KDR
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