[aprssig] slightly OT talking about 9k6

Brian D Heaton ky9k-lists at ky9k.org
Sat May 7 16:00:14 CDT 2016


The TT4 can't encode 9600 yet. Still decode only.

Audio dongles/boards aren't nearly as difficult and fiddly as you might 
think. If nothing else, it is something to keep in mind when balancing 
the cost of a 9K6 TNC vs and audio board that can do that and more.

73-KY9K/Brian


On 5/7/2016 10:16, Charles Blackburn via aprssig wrote:
> 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?
> Charlie
>
> -----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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