Re: PI TNC - progress report.

Perry Chamberlain <canoeman@...>


On Sep 21, 2012, at 5:10 PM, Matthew Pitts <daywalker_blade_2004@...> wrote:



Either option would be satisfactory for me. Keep up the good work on this.

Matthew Pitts

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From: gm8bpq <john.wiseman@...>;
To: <Raspberry_Pi_4-Ham_RADIO@...>;
Subject: [Raspberry_Pi_4-Ham_RADIO] Re: PI TNC - progress report.
Sent: Fri, Sep 21, 2012 12:28:19 PM



I'm discussing with the maker of the TNC-X the possibility of him making and selling the boards. If that doesn't come off, I'll at least make the PCB and software availabale, so you can build your own.

73, John

--- In Raspberry_Pi_4-Ham_RADIO@..., ve2hom Pascal wrote:
> Hi John,
> This sound very cool, give us news about your project. Do you plan
> to make these board available to sell ?
> 73 de Pascal
> ve2hom
> Le 20/09/12 16:27, John Wiseman a écrit :
> >
> > Hi,
> > For those fairly new to the group, I have been working on a TNC for
> > use with the pI that is the same size as the pi and plugs into the
> > expansion header. The prototype was a TNC-X, with a 26 way header
> > superglued to board. There is a photo of it on the home page of this
> > group.
> > I've now received the first PCB's, and built a couple. There are
> > photos at and
> > The TNC is largely
> > based on the TNC-X, but I've replaced the serial port with an i2c
> > connection, so more than one can be connected to the PI. The current
> > board has a mini-DIN radio connector, but I find mini-DIN plugs very
> > difficult to wire, and the connector is just too high to stack
> > properly, so the final version will probably have a DB9. I've written
> > a linux driver that takes the i2c data stream, and converts to a pty
> > that can be used with the normal linux ax.25 kissattach program. All
> > this seems to be working.
> > I've a couple of developments in the pipeline. One is to replace the
> > MX 614 modem, hopefully with a PIC based solution. Although the 614
> > works very well, it is relatively exensive, and only works at 1200
> > baud. I hope to be able to run at 300 for HF use. I've also bought a
> > couple of RFM22B modules. These are tiny 100 mW 434MHz data
> > tranceivers - see
> > I plan
> > to do a version of the TNC using this module.
> > A version using the FX 489 modem for 9600 baud links is planned, nut I
> > haven't started work on that yet.
> > 73, John G8BPQ
> >

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