Batboard

Posted: **Mon Jun 09, 2008 6:11 am**

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

Thanks

Posted: **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?

Posted: **Mon Jun 09, 2008 8:39 am**

Same as the maxtrac IIRC except for the 2 outside pins

Posted: **Mon Jun 09, 2008 8:47 am**

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

Posted: **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.

Posted: **Thu Jun 12, 2008 5:30 am**

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

Posted: **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.

CDM Mic Wiring