Electronics > Repair

Maxon PM100 PMR EEPROM

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david17:
Hi, I have removed the EEPROM AT93C56 from the pcb and read the code with a TL866. At the moment, all 4 channels are the same 171.43762. I would like to re-program this to 2 meters. Any idea how to work out the code needed.
Thanks, David.

coromonadalix:
well post the eeprom content  first,  and maybe some  can or could help

david17:
000000:86\08\97\26\D6\17\86\08\97\26\D6\17\86\08\97\26\
000010:D6\17\86\08\97\26\D6\17\

000060:\C8\C8\C8\C8\00\00\00\00\00\00\00\00\00\00\00\00\
000070:00\00\20\0A\00\00\03\30\00\00\00\00\00\00\00\00
000080:\00\00\00\00\00\00\0F\00\0F\00\00\32\00\00\00\00\
000090:all FF to end

My bin file after removing a lot of 00 and FF at the end.
David

coromonadalix:
found this today   scroll down to maxon  ....

http://www.cqham.ru/sch_eng.html   interfaces and softwares

as i see it

86\08\97\26\D6\17  is one channel
86\08\97\26\D6\17
86\08\97\26\D6\17
86\08\97\26\D6\17

for the rest ???

david17:
Yes, as my 4 channels are the same  86\08\97\26\D6\17  must = 171.43762. Would be nice to know how the hex is worked out for other frequencies.
I had found the site in the link you sent. When click on the software link I get "File not downloaded: Potential security risk." so I stopped there.

I would think the code at the bottom is the power setting and CTCSS frequency.

The interface circuit shows a 25 pin coms connector not in my radio.

Thanks, David

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