JOTRON electronics a.s.
December, 99
Page 22
3.3. Changing the operating frequency
The operating frequency could be changed directly by turning the FUNCTION switch to the
MHz or kHz position. If the FUNCTION switch is in either of these positions, the SELECT
switch will change the frequency in steps of either 1 MHz or 25 kHz.
Rotating the SELECT switch clockwise increase the frequency and anti clockwise decrease it.
3.4. Selecting pre-programmed channels
Put the FUNCTION switch in the CH position and rotate the SELECT switch till the
appropriate channel shows up. The channel is first shown with the CH number and after app.
1-2 seconds the frequency is shown. To operate on the recalled frequency just leave the
switch in the CH position.
3.5. Programming a channel
With the function switch in the CH position, select the channel to be changed. Then select the
desired frequency to be programmed as described in section 3.3. Now, push and hold in the
SQUELCH button while turning the SELECT button clockwise simultaneously. The new
frequency will now replace the old one in the selected channel.
3.6. SQUELCH on/off
The SQUELCH button toggles the squelch on and off simply by pressing in once. With the
squelch in off position background noise will be heard in the loudspeaker. When the squelch
is on, a marker will come up in the display window.
To adjust the squelch level see internal adjustments, section 4.
3.7. Keying the transmitter
The transceiver may be keyed in local position by the PTT connection on the microphone
socket, or at the rear connector pin 15 (LOCAL KEY INPUT).
In remote position the transceiver can be keyed either by line loop keying (phantom keying)
directly on the 600Ω line input, by applying a DC voltage to rear connector pin 2 (REMOTE
KEY DC INPUT), or by grounding rear connector pin 7 (REMOTE KEY GND INPUT).
When the transceiver is keyed, the carrier indicator will light and the receiver will be muted.
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