I would have initially suggested a bad mic but, since you've tried two,
that's not the likely cause. Since the transmit light illuminates and
you're transmitting carrier, verified, I assume, by a separate receiver,
I'd look at your common wiring between your mic and the radio
connector. Check with an ohm meter. I've seen broken wires inside of
intact insulation.

On 9/19/2016 10:23 AM, AS wrote:
I have a question for all the electronic wizards out there. My radio is only giving a carrier signal but no modulation. I have the following set-up:
Dittel FSG71M
Dittel speaker box F10061 with two DIN connectors for two microphones (only one used)
Dynamic goose neck microphone F10039

I tried both goose neck mic.'s I have in both positions on the box.
The yellow LED on the radio turns on but no voice transmission occurs.
The power supply is provided by two 12V, 9.6Ah Lithium Iron Phosphate batteries in parallel which are rock-solid.

Any suggestion for where to start trouble-shooting?

Thanks,

Uli


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Dan, 5J