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[aprssig] APRS propagation monitor

John Gorkos jgorkos at gmail.com
Wed Jun 6 18:22:49 UTC 2012


Here is a quick chart showing the relative sensitivity of various packet
decoding engines.  There are several disclaimers on the site, but I think
the numbers comparing hardware decode to software decode are in the right
ballpark:
https://sites.google.com/site/ki4mcw/Home/arduino-tnc

(scroll about one page down).

To winnow out direct packets, just look for "*" in the list of
digipeaters.  If you see one, you know it was touched by a digi.

John Gorkos

On 6/6/12 2:10 PM, "Chris Howard w0ep" <w0ep at w0ep.us> wrote:

>
>A bit of progress on my APRS propagation monitor.
>
>This is on a linux box.
>
>I have soundmodem running and a perl program which
>gets the packets from the soundmodem TNC/serial interface
>and parses them out.  I get distance and direction.
>
>I've been a bit depressed by the low number of packets
>coming through.  One problem is my antenna is rather low.
>The other problem, I think my laptop's soundcard
>is none too good.  (This is a Thinkpad 600x circa 1999.)
>A lot of packets that I think it should decode it does not.
>If I watch with the CRC turned off in soundmodemconfig mode,
>I can see lots of partial packets go by.  I upgraded my
>memory a bit, and explored going to a real time kernel,
>but no success.
>
>Anyway, on the software side the next thing I need to
>do is winnow out direct packets from digipeated packets.
>It looks like it might be a rather complicated process.
>
>And I am cogitating on how to specify match conditions
>and notification actions.
>
>Chris w0ep
>columbus, MS
>
>
>
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