Motorola MX-300 Radio Revival
EPROMS in the MX-300S synthesized radios
When you remove the back cover, the synthesizer unit is at the bottom
of the main PCB where the channel elements are normally found on a crystal
controlled radio. There are program once versions of the PROMS and
reprogrammable EEPROM versions. The top of the metal can with the
three screws contains the PROM. The PROMS are numbered either 5096A,
5096B, 5096C, 5096D. The last letter indicates what type of PROM you
are looking at.
The 5096A and 5096B PROMS are one time fusable link devices and once
you program a channel, you are stuck with it. If there are empty channels
you can still program them.
What you really want to find are the EEPROM modules with the part number
5096C and 5096D, these are the reprogrammable EEPROM devices. You
can reprogram them as many times as you like using a Motorola 1801 suitcase
radio programming system if you have the right firmware and cables for the
programmer. These programmers go for $1000 to over $2000 on Ebay so
most of us don't own them.
You can find individuals and radio shops who will program your PROMS
for a fee. I suggest you contact John Hansen who offers this service
at reasonable rates.
Microphone / accessory connector pinouts
Module numbers by band
Various MX-300 series models
MX300S with Scan
Ruggedized MX300R...or is R for "rubberized"
Convertacom mobile dock.