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CP200d Won't Transmit with Racing Radios Headsets

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CChamblee25

CChamblee25

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I have two CP200d devices that will transmit OK using the radio's PTT button, but they will not transmit when using Racing Radios headset, Racing Electronics headset or Rugged Radios headset. They both work OK with a OEM Motorola shoulder mic. Both of these radios are the JC2AN models (which come from factory as analog-only) that have had the digital entitlement added. After doing some experimenting, it appears that most CP200d radios will transmit with mic impedance loads down to 200 ohms, but these two subject radios will not transmit unless the mic impedance load is a minimum of about 700 ohms. I have updated the firmware on both to 1.01.49, same firmware as my other working CP200d radios. I've also tried powering the radios on with the headset plugged-in, and also powering-on the radios and THEN plugging in the headset. In summary, it appears that these two radios will not "key-up" with low-impedance mics. Anyone run into this, or have a solution?
 
merlin

merlin

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Either replace the mic with the proper impedance for the radios or use an inline impedance matching transformer.
Yea, I had a similar issue with a low impedance Astatic 10D onto a transmitter with high impedance mic input.
It is not about the firmware at all, it is the hardware.
 
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