[aprssig] Interesting Preliminary Findings on Soundcard "Soft TNC" Shootout

Andre aprs at pe1rdw.demon.nl
Mon Dec 26 10:58:59 EST 2011

Op 26-12-2011 16:35, Steve Noskowicz schreef:
> Steve,
>   This is a well done test and report and expected based on what I know of your experience.  One question is how many good packets in a row did you consider to be at the "consistently decoding the packet burst" point?
>    I'd say the 1 dB difference at 1200 baud is virtually insignificant, no?
> I would have asked if you were planing pre/de-emphasis shaped tests, but you answered it already.
> Not to wanting to make work for you, but an identical setup comparison with some of the Hardware TNCs would be really nice, I'm sure you'd have to admit.
I did an inpractice comparason between uh7ho soundmodem and a mfj 1278 
multimode tnc at 300 baud packet on 10.151 lsb.
Any packet i could recognise on the waterfall was decoded by the 
soundmodem but the mfj decoded ZERO packets after days of trying, both 
the tnc and soundcard where connected in paralel to the patch af out of 
a ft-757gx.

So next time someone claims a tnc works better then soundcard at 
decoding I will just shake my head.

73 Andre PE1RDW

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