[aprssig] 2 Port Digitpeater was: APRS UHF freq? (9600 baud)

John D. Hays john at hays.org
Tue Jan 24 18:43:16 CST 2017


It is a pretty straightforward project with direwolf and the UDRC-II.
 9600/1200 operation is easily supported and cross port digipeating is
possible.  I've even done experimental 9600 and 1200 baud through the same
radio and port.

https://nw-digital-radio.groups.io/g/udrc/wiki/UDRC%E2%84%A2-and-Direwolf-Packet-Modem

If you want a quasi-national APRS frequency, go below 440 to the 430-440
band.

On Tue, Jan 24, 2017 at 2:09 PM, Robert Bruninga <bruninga at usna.edu> wrote:

> Re 9600 and UHF,
>
>
>
> I have slowly begun to start using local UHF repeaters (and meeting newer
> voices) for just the reason you mention (VHF desense).  We have DOZENS of
> UHF repeaters in our area (Maryland/DC)).
>
>
>
> Just a note.  9600 baud APRS gains only about a factor of 2, not the
> expected factor of 8, because of the fixed overhead of TXD and other T/R
> delays.  Combined with the significantly less range of UHF for the same
> class antennas, there is almost no incentive to operate APRS style bursts
> on UHF at 9600 baud.  That is why it has never taken off.
>
>
>
> But actually moving TRAFFIC through a fixed long linear 9600 baud
> conventional packet links is something we should have been doing since 1998
> when every APRS radio by Kenwood put dual band 1200/9600 baud TNCs in the
> hands of almost every operator.  But no one uses this powerful 9600 baud we
> have had for 19 years.
>
>
>
> I want to build a 9600 baud East coast packet network.
>
> See:  http://aprs.org/ec9600net.html
>
>
>
> Bob, WB4APR
>
>
>
-- 

------------------------------
John D. Hays
K7VE

PO Box 1223, Edmonds, WA 98020-1223
   <http://k7ve.org/blog>  <http://twitter.com/#!/john_hays>
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