On Monday, August 29, 2016 at 7:08:08 PM UTC-4, Karl Striedieck wrote:
Looking for advice on improving the radio transmissions in the recently acquired Duo Discus XL.

The factory installed Microaire M760-1 radio and Bayerdynamic SHM 424 microphone work fine - if you are practically eating the mic. If your head is turned slightly no voice, only carrier.

Anyone know of a gain adjustment of some sort to make the mic more sensitive?

Thanks in advance.

Karl Striedieck

There are two trim pots on the right side of the radio. Rear is mic gain. Para 4.8.2 of the P rev manual says
quote
Please refer to the figure below to see how the trim pots are adjusted. The trim pots have a total movement of only 270 degrees (3/4 turn). The heads of the trim pots are plastic, and can be distorted or broken off unless adjusted with great care. A small straight blade screwdriver with an insulated shaft is required. Ensure the radio is turned off before punching the hole under the black dot, and probing for the slot in the head of the trim pot. Once the screwdriver is engaged on the trim pot, the radio can be turned on, and the adjustment made.
unquote
The other trim pot is for sidetone. I had feedback and adjusted the mic gain to sort it out. Counterclockwise turn decreases mic gain.

Dan