[aprssig] Dirty signals vs. hardware TNCs

Curt Mills curt.we7u at gmail.com
Wed May 11 22:54:23 CDT 2016

Might be a good place to plug a new Wiki page. Explains how to set
deviation of a 1200-baud TNC/Radio combo using a $20 RTL dongle.


On Wed, May 11, 2016 at 7:07 PM, John Langner via aprssig <aprssig at tapr.org>

> Suggested reading on the subject.
> 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-Demodulator-Part-1-1200-baud.pdf
> 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-WA8LMF-TNC-Test-CD.pdf
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Curt, WE7U
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