[aprssig] Dirty signals vs. hardware TNCs

spam8mybrain spam8mybrain at yahoo.com
Thu May 12 13:34:35 CDT 2016


Ah, preaching to the choir. If only we could get the word out to the rookies who don't know to look here yet....
At least Kenwood puts references to Bob Bruninga's documentation in their manuals (and even a section Bob himself wrote). But the Kenwoods are factory pre-aligned. Can we get the other APRS manufacturers (hardware and software) to spread the word as to where newbies can find directions so they aren't left wandering in the wilderness of malfunctioning equipment without usage directions? I think I'm going to add some menu choices to my application's Help menu to bring up the user's browser pointed at the major APRS documentation centers. If only said documentation centers were better organized (back to my earlier plea for The Complete, Concise, and Organized Guide for the APRS Newbie).
Andrew Pavlin, KA2DDO 

-------- Original message --------
From: Curt Mills via aprssig <aprssig at tapr.org> 
Date: 05/11/2016  11:54 PM  (GMT-05:00) 
To: wb2osz at comcast.net, TAPR APRS Mailing List <aprssig at tapr.org> 
Subject: Re: [aprssig] Dirty signals vs. hardware TNCs 

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.
http://xastir.org/index.php/HowTo:Set_Deviation_via_RTL

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




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
http://wetnet.net/~we7u
http://www.sarguydigital.com

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