[aprssig] E Coast 9600 baud backbone 15W radios (firmware?).

Robert Bruninga bruninga at usna.edu
Wed Jun 1 17:23:55 EDT 2016

I guess because it would take a lot of work fussing with Ebay for days on
end trying to scrape up a bunch of identical radios.  Or are you saying
that they can be found in 20 unit quantities at that price?  If so, that’s
not a bad approach.

But I do want the 9600 baud backbone to begin with identical units to
minimize the unknowns in getting it up and running.

Bob, WB4aPR

*From:* Kenneth Finnegan [mailto:kennethfinnegan2007 at gmail.com]
*Sent:* Wednesday, June 01, 2016 5:04 PM
*To:* Robert Bruninga; TAPR APRS Mailing List
*Subject:* Re: [aprssig] E Coast 9600 baud backbone 15W radios (firmware?).

I'm still a bit unclear; why are you trying to homebrew data radios with
out-of-band PAs when you can get 25W UHF CDM1250s on eBay for less than
$100 a piece? I've been converting all my packet stations over to
CDM750/CDM1250s; the standard Motorola 16 pin IO connector is fantastic for

Kenneth Finnegan

On Wed, Jun 1, 2016 at 9:40 AM, Robert Bruninga via aprssig <
aprssig at tapr.org> wrote:

By the way, I may have found a possible UHF exciter to get the radios
working on 420 MHz, but the question is, is using the KA Packet nodes in
the Kantronics KPC-9612’s the only way to do the level 4 network?  Although
I am sure we can find enough KPC9612’s for the 15 sites, I’m wondering
about long term viability?

Is there software out there to replicate the KA-NODE network (I think it is
same as THENET or theoriginal NETROM nodes?  Othern than the nice
off-the-shelf approach of the KPC9612’s?


*From:* Robert Bruninga [mailto:bruninga at usna.edu]
*Sent:* Friday, May 27, 2016 11:31 AM
*To:* TAPR APRS Mailing List
*Cc:* Robert Bruninga
*Subject:* E Coast 9600 baud backbone 15W radios.

At Dayton I picked up a box of 25 UHF data radios for the E Coast 9600 baud
backbone project.

Turns out, they are on 824 MHz.  But they have a 15 W driver stage that can
give us 15 Watts in the 420 MHz amateur band if we can find a simple UHF
transceiver with 1 Watt output.  ALl we have to do is bypass the final 45W
PA and add a TR switch.

Then add a TNC node and we are done.

See the info on these radios at the bottom of this page:

So, does anyone have ideas for the 1W UHX XCVR that we can split out the TX
and RX separately so we can use these PA's?

The data radios include a GPS receiver, but we wont need thoes in this


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