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Re: MFJ 1270B + 9600 Modem

While were on the subject, has anyone on AMSAT-BB successfully doubled the
1270B's clock speed to 4 MHz and replaced the CPU, SIO, and EPROM with
faster components to operate at the higher clock speed?  If so, what was
the part number of the SIO used?  My reason for asking is because I recently
purchased a Z80 SIO/2 that does not function in the TNC, even at the standard
clock speed.  The original component was a Z80 SIO/0.

When operating at an RF speed of 9600 bps, and a terminal rate of 19.2k,
I have observed that the 1270B occasionally drops characters when receiving
data from KO-23.  My thinking is that doubling the TNC's clock speed may
solve the problem.

73, de John, KD2BD
-=-=-=-=-=-=-=-=-=-=-=-=- John A. Magliacane, KD2BD -=-=-=-=-=-=-=-=-=-=-=-=-
Internet  : kd2bd@amsat.org          |  Voice : +1.732.224.2948
Satellite : AO-16, LO-19, KO-25      |  Morse : -.-  -..  ..---  -...  -..
Packet    : KD2BD @ KS4HR.NJ.USA.NA  |  WWW   : http://www.njin.net/~magliaco/
Video     : 426.250 MHz/439.250 MHz  |  FAX   : +1.732.224.2060
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