JOTRON electronics a.s.
December, 99
Page 23
4. INTERNAL ADJUSTMENTS
4.1. SQUELCH ADJUSTMENT
On the receiver unit in the TR-6201 driver unit, a pot. meter, R14 is available. This pot.meter
can be used to adjust the squelch level, and is available on the left hand side of the TR-6201
driver unit.
The squelch is preset to open at approximately 2 µV and can be adjusted to open between and
2 and 50 µV.
To adjust the squelch use the following procedure:
• Open the top-cover of the transceiver, TR-6101, by turning the 2 screws in the cover a half
turn counter clockwise.
• Locate the TR-6201 driver unit and the trim.pot for the squelch adjustment on the left hand
side of this unit.
• Connect a signal generator with a modulation of 30% AM and modulated with a 1 kHz
audio signal to the antenna input socket. The level of the generator should be equal to the
level that is wanted for the squelch.
• Adjust the squelch-pot. first clockwise until it close (no signal is heard in the loudspeaker),
then counter clockwise until it opens again. Make sure that the squelch is on (a mark is
shown in the display).
• If no signalgenerator is available, and the squelch needs readjustment because of high
background noise, the squelch can be adjusted by first turning the pot.meter counter
clockwise until it opens the squelch. Then clockwise until no noise is heard, i.e. squelch is
closed.
• Replace the top cover of the transceiver.
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