Additional Microphone & Speaker CDM Series?

[paramedszaf]

New chiefs car is coming equiped with a CDM series VHF radio in the passenger compartment. I know the Dual-head kits are no longer made by the aftermarket distributer.. Is there a way to run and additional microphone & speaker to the cargo / command area of the vehicle?

 

[HarryWilly]

I know the Dual-head kits are no longer made by the aftermarket distributer..

No they are... (as far as I know):http://www.idaco.com/QM_Brochure.pdf

Other than that, the answer is not safely. If you get the pinouts of the mic, you can make a splitter with diodes, and other small electronics, but it may be easier to get a second radio based on what you need.

 

[DPapay]

Easy to do, the CDM 16 pin accessory plug on the back is similar to the radius mobile line.
External Speaker, 1 and 16.
Mic, 2
PTT,3
Ground,7

 

[paramedszaf]

Anyone know where to find a schematic to do this operation?

2 external speakers, and additional MIC and ignition sensing connection...

I know I have see it does with networking cable but haven't seen how it all comes together...