[aprssig] slightly OT talking about 9k6

Charles Blackburn ai4ri at cfl.rr.com
Sat May 7 12:16:09 CDT 2016

I realise that, but I don't wanna spend nigh on 700 bucks on a radio just for a 9k6 tnc when I have perfectly good 9600 data radios already available.

As for sound card interfaces, that's not going to be an option for the environment and having just the right dongle etc right now it's just not feasible.

Agreed having faster than 9k6 QPSK or fsk would be great, but I don't think a pi could handle that with 2 1200 tncs, 2 9k6 links running "soundmodems".

Anyone know if the TT$ can encode 9k6 yet?

-----Original Message-----
From: aprssig [mailto:aprssig-bounces at tapr.org] On Behalf Of Bill Vodall via aprssig
Sent: Friday, May 6, 2016 18:27
To: rich at n1oz.net; Rich Osman; TAPR APRS Mailing List
Subject: Re: [aprssig] slightly OT talking about 9k6

On Fri, May 6, 2016 at 3:01 PM, Rich Osman via aprssig <aprssig at tapr.org> wrote:

>> Does anyone have a line on 9k6 KISS tnc's that are (relatively) cheap to get  a hold of?

The right solution today is a Kenwood D710.   Considering time and
frustration - it'll be the best working system.

> Dire Wolf on a Raspberry Pi is purported to work better than hardware solutions and will do 9600.  $35 + $5 USB soundcard dongle.

The 9600 is still a real problem with USB soundcard dongles.  There
are issues with transformers and DC blocking capacitors.   This is a
solution that shows real promise but there are still challenges.

FWIW - not the question at hand but related - the 4800 QPSK mode (UZ7HO and others soon) is working out better but still requires direct discriminator audio.  3600 QPSK is working solid with speaker audio.

Bill, WA7NWP
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