[aprssig] Baofeng radio for igate use

John Langner WB2OSZ wb2osz at comcast.net
Tue May 9 20:05:29 CDT 2017


What does a good APRS signal look like?
What do less-than-ideal signals look like?
How can the demodulator compensate for imbalanced tone amplitudes?


Here, we take a closer look at some of the frames on the TNC Test CD in
hopes of gaining some insights into why some are easily decoded and others
are more difficult. There are a lot of ugly signals out there. Many can be
improved by decreasing the transmit volume. Others are just plain weird and
you have to wonder how they are being generated.

https://github.com/wb2osz/direwolf/raw/master/doc/A-Closer-Look-at-the-WA8LM
F-TNC-Test-CD.pdf


Sometimes it's a little mystifying why an APRS / AX.25 Packet TNC will
decode some signals and not others. A weak signal, buried in static, might
be fine while a nice strong clean sounding signal is not decoded. Here we
will take a brief look at what could cause this perplexing situation and a
couple things that can be done about it.

https://github.com/wb2osz/direwolf/raw/master/doc/A-Better-APRS-Packet-Demod
ulator-Part-1-1200-baud.pdf 




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