CDM1250 Adapter To CM 300

[AKANathan69]

I'm wondering how to make an adapter for a Motorola CDM1250 programming cable to CM 300 programming cable i have been told that people have been able to make this work but i haven't seen how to do it. If any one has a how to video or a diagram or even well typed how to list will be much appreciated.

[SteveC0625]

I'm wondering how to make an adapter for a Motorola CDM1250 programming cable to CM 300 programming cable i have been told that people have been able to make this work but i haven't seen how to do it. If any one has a how to video or a diagram or even well typed how to list will be much appreciated.

I posted the answer to your question over on radioreference last night.

FWIW, using the search function, I found the answer myself several months ago here on the batboard. The original answer was posted here back in 2004: http://batboard.batlabs.com/viewtopic.p ... 00#p178123

[escomm]

FWIW the schematic calls for a 1k ohm resistor across those pins. I've found that using too small a gauge of wire (like 24 gauge) doesn't provide the resistance needed.

[AKANathan69]

thank you very much

[centronic]

to all user: the only different between cdm and cm300 program cable is a jumper between pin 1 and pin 3 on the rj45 connector. since you can't set 2 cables in the rj45 connector, open the db25 connector and finf the two wires that goes to position 1 and 3 in rj45 and sldered together, and the most important thing is that the cable works for both radio cm or cdm. the adater is not need it anymore.

[Will]

I've found that using too small a gauge of wire (like 24 gauge) doesn't provide the resistance needed.

???????

[HLA]

no resistor needed but the pins that get jumped is confusing to some, motorola is backwards from the rest of the world so some say 1&3 get jumped, others say 6&8 get jumped