microHAM micro KEYER Manual page 16

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transformer there is a small white "screw driver" trimmer. You can access this trimmer by a small hole
located at the right side of the top cover. With this trimmer you can select a portion of the audio level
from main MK front panel RADIO pot for radio MIC IN. This portion of level is applied when audio routing
"C" is selected in the Router - Audio Switching tab. Following approach is recommended:
a) Select MK RADIO pot to about three o'clock possition.
b) Select routing "B" for transmiting from computer (audio goes to rig AF IN) and using windows mixer
sliders adjust appropriate (not overdrived) level.
c) Select routing "C" for transmiting from computer (audio goes to rig MIC IN) and using trimmer and
transceiver MIC GAIN adjust appropriate (not overdrived) level.
This approach allow you to use front MK RADIO pot for both routing B and C and have always enough
margins when you change bands, modes (compressor ON/OFF) etc ... without needs to change windows
mixer settings or trimmer position.
3.
Inside the MK on the top PCB, on the left side, two jumpers are located for selecting integrated
preamplifier inserted between attached microphone to RJ45 MIC jack or EXT MIC jack and computer
MIC IN input. Turning preamp ON is not neccessary for electret microphones as are used with Icoms
radios. Turn this preamplifier ON for Kenwoods and Yeasus original dynamic microphones (also Heil).
By default factory settings, this preamplifier is bypassed.
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