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

Brian D Heaton ky9k-lists at ky9k.org
Wed Jun 1 18:58:59 CDT 2016


TNC Side - Instead of a hardware TNC and limited 80s/90s firmware, how 
about an RPI3 with a UDRC for the radio interface and Direwolf ( 
https://github.com/wb2osz/direwolf ) for the soft TNC. BPQ32 (linbpq) is 
available for the RPI and works well. That will give you a reliable, 
flexible, and expandable system that also comes out cheaper.

73-KY9K/Brian


On 6/1/2016 15:56, Kenneth Finnegan via aprssig wrote:
> 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 <mailto: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
>     <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 <mailto: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
>         <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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