Hi,
Here are the schematics for the MX614 board designed by Paul Breed:
http://www.rasdoc.com/splinter/Splinter.pdf
cheers,
Jamie
http://142.104.54.173
Gerd wrote:
> Hello Jamie,
>
> > Your schematic with the FX614 has the exact pinout of the MX614 so it looks like
>the same
> > chip. I see that you use a uart design for your modem. The design that I am using
> > (designed by a guy named Paul Breed for his own project) hooks up to a
>microcontroller
> > instead of a com port so the controller side circuitry is a bit different. M0,
>M1, Rxd,
> > Txd, and the energy detect pin each have independant lines to the microcontroller.
> Also
> > another difference is the Clk and Rxeq pins are not used. Instead a timer in the
> > microcontroller polls the Rxd pin to receive data at 1200baud. I start polling
>the Rxd line
> > when the Det (receive energy detect) line goes high. I'm still working on this
>code to get
> > it sampling the Rxd pin properly in the middle of each received bit. Any help on
>this would
> > be fantastic!
>
> That all sounds good ;) Is there a way to get that microcontroller
> based schematic somehow? Just because I think one should do
> more than only replacing that ol' baycom modem :)
>
> > The audio hookup to the mic and speaker are basically identical except for your
>design you
> > have the M0 status to turn the PTT/VOX on/off. M0=1 for Tx and M0=0 for Rx The
>design Paul
> > made uses a seperate microcontroller pin -> transistor to turn the vox on/off.
> >
> > I am planning on coding in the AX.25 protocol into the microcontroller and putting
>it in the
> > rocket we are making then using the linux AX.25 package with the soundmodem to
>communicate
> > with it.
>
> I wish you the best successes with that!
>
> Cheers, 73
>
> Gerd
