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

Kenneth Finnegan kennethfinnegan2007 at gmail.com
Wed Jun 1 17:56:55 CDT 2016


Ebay user buyhitek lists CDM1250s with the 403-470MHz split (which he
incorrectly lists as 403-512MHz) in lots of 1, 5, and 100:
http://www.ebay.com/itm/301670665474

To answer Erv's question, I've never used them at 9600, but the Moto 16pin
does give you direct discriminator and modulator access, so I'd be shocked
if they didn't work well for it.

--
Kenneth Finnegan
http://blog.thelifeofkenneth.com/

On Wed, Jun 1, 2016 at 2:23 PM, Robert Bruninga via aprssig <
aprssig at tapr.org> wrote:

> 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
> packet.
>
>
> --
> Kenneth Finnegan
> http://blog.thelifeofkenneth.com/
>
>
>
> 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?
>
>
>
> Bob,WB4APR
>
>
>
>
>
>
>
> *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:
> http://aprs.org/ec9600net.html
>
> 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
> application.
>
> Bob, WB4APR
>
>
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