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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.
--- In Raspberry_Pi_4-Ham_RADIO@yahoogroups.com, ve2hom Pascal <ve2hom@...> wrote:
This sound very cool, give us news about your project. Do you plan
to make these board available to sell ?
73 de Pascal
Le 20/09/12 16:27, John Wiseman a écrit :
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
I've now received the first PCB's, and built a couple. There are
photos at https://dl.dropbox.com/u/31910649/S1300001.JPG and
https://dl.dropbox.com/u/31910649/S1300002.JPG. 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
http://www.sparkfun.com/datasheets/Wireless/General/RFM22B.pdf. 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