[aprssig] debugging RF 'spam'

Bob Bruninga bruninga at usna.edu
Tue Dec 27 13:08:57 EST 2011

The fact that you had no stations on day 1, and then lots on day 2, suggests
to me an anomaly in propogation.  Sometimes this happens and packets comein
from hundreds of miles away (near water like you are on LI).

But your complaint is valid if you routinely receive a FREQ OBJECT for
something that is too far away to work.

The thing to check is the distance of the object form the W1OEM injecting
station.  That should be local to it.
Once it left W1OEM, then that was either a fluke of proppogation or W1OEM is
using too long of a path.

Bob, Wb4APR

-----Original Message-----
From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On Behalf
Of Sander Pool
Sent: Monday, December 26, 2011 5:57 PM
To: TAPR APRS Mailing List
Subject: [aprssig] debugging RF 'spam'


I'm visiting outlaws (eh, in-laws) in Sagaponack, NY which is near the
end of Long Island. Yesterday there was a drought of APRS packets on my
D72 but this afternoon I received a whole bunch. I was surprised to get
W3PGC-10 which is a TCPIP injected Winlink2000 object. My D72 says the
last station was W1OEM. It apparently picked up the packet from APRS-IS
and put it out on RF. The good thing is that the packet contains
frequency information which would allow my radio to tune to it with a
simple menu operation. This is very rare unfortunately. Different topic
for a different time :)

In any case, the station is so far away from me I'll never reach it with
VHF from where I am now.

Is this a misconfiguration on the part of W1OEM or are winlink packets
not configured correctly? Sorry, I don't know enough yet about the
protocol to debug this myself. KB3KOW-10 was received in the same fashion.

I think that sending objects like repeaters (rare) and RMS Packet
stations out on RF is great. When you're out in the field without
internet it is one of the few ways to get access to these services. It
seems that in this case perhaps the packets propagate too far?


     Sander W1SOP

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