CDM Mic Wiring

JD · Post by JD » Mon Jun 09, 2008 6:11 am

Any one familiar with how the PTT on CDM series mic is configured?

Thanks

HLA · Post by **HLA** » Mon Jun 09, 2008 8:15 am

what exactly are you looking for? if you go to the model specific info page for the cdm's you will probablly find what you are looking for?

Post by **escomm** » Mon Jun 09, 2008 8:39 am

Same as the maxtrac IIRC except for the 2 outside pins

JD · Post by JD » Mon Jun 09, 2008 8:47 am

Thanks, if you use a CDM mic on r1225 repeater, it will lock it in transmit.

Will · Post by **Will** » Mon Jun 09, 2008 1:38 pm

JD wrote:Thanks, if you use a CDM mic on r1225 repeater, it will lock it in transmit.

This IS true. The R1225 does not have enough "pull-up" on the PTT line.

JD · Post by JD » Thu Jun 12, 2008 5:30 am

Also found out that there is DC bias on the mic hi line.

Will · Post by **Will** » Thu Jun 12, 2008 3:52 pm

JD wrote:Also found out that there is DC bias on the mic hi line.

All Motorola mobiles have the "DC bias" on the MIC Hi line.