[aprssig] re-purposing MFG 1278B?

Kris Kirby kris at catonic.us
Tue Dec 10 13:11:14 EST 2019

On Mon, 9 Dec 2019, Ron VE8RT wrote:
>    there is a MFJ 1278B sitting on a shelf here.  From reading the 
> thread on YAAC I've learned that TAPR offer (or offered at one time) 
> replacement EPROMS.  My questions are: is the MFJ 1278B worth an EPROM 
> upgrade (what would it be good at)?  And if so, where could I buy 
> replacement EPROMS and documentation?  I've glanced at the TAPR 
> website and don't know exactly what I'd be looking for.
>    Thanks, Ron VE8RT

The 1278 tends to default to 2400,E,7,1 IIRC. Annoying enough that a 
brain swap is an improvement. If you have a need for something that does 
the job in hardware, it's not a bad idea. OTOH, there are TNCs out there 
which have software DCD, and a software DCD should be used with a TNC2 

DCD is an active low input on the TNC, and by pulling DCD to ground, 
it's possible to allow a TNC to share a radio. 

Kris Kirby, KE4AHR
Disinformation Architect, Systems Mangler, & Network Mismanager

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