The handheld is about 10 - 15 kHz off frequency
This handheld has a little mechanical problem: The speaker touches
physically the small diode shown in the photo. So with a fall-off or a
big shock, the diode could be broken or get de-soldered.
The diode is a 1SV230 varicap (D2016). It is used as DCS modulator,
so it can be safely replaced with a similar one, or in a desperate
situation, replace it with a fixed 10-15pF capacitor. In this case, you
will lost the DCS function.
Once fixed (for any of the two methods described above) you must
adjust the TX carrier frequency with the small trimmer marked with a red
arrow and a frequency counter.
Low modulation
If you consider the modulation level is too low or too high, you can
adjust it with the two variable resistors marked in the photo. The left
one is for VHF and the right one is for UHF. Please, do not
over-modulate! You will create adjacent channel interference and you
will have problems being received with low signals. It is preferred to
be somewhat under-modulated that to be over-modulated.
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