Kenwood TS-790A Instruction Manual page 44

4-7. TONE SQUELCH (CTCSS) (TS-790A
only)
4-7-1. Tone Squelch Operation Initiated by the Dis-
tant Station.
Note: - i
This function requires the use of the optional TSU-5
Programmable Tone Decoder Unit.
This function atlows you to remain squelched until the
proper Tone Frequency is received. if you are on a
busy repeater this can be quite an aid.
1, Press the CTCSS key. The CTCSS indicator will
light in the Display Panel.
2. Your radio will now remain squelched until the
proper code is received. You should ensure all the
stations you wish to communicate with use the
same Tone Frequency. Please note that the
97.4 Hz Tone does not function for decode pur-
poses. Please see Section 4-6-4 TONE OPERATION
for programming the CTCSS Tone Frequency.
3. To release the Tone Squelch function {normal noise
activated squelch}, press the CTCSS key again. The
CTCSS indicator should go out on the Display
Panel.
Note: _____—_—.
Switching the CTCSS function ON activates the Tone
Frequency filter that attenuates low audio frequencies.
This filtering slightly affects the quality of received
audio, but does not indicate a transceiver malfunction.
4-7-2. To Open the Tone Squelch of a Distant Station
Even if the optional TSU-5 Programmabie Tone
Decoder Unit is not installed, your radio can open the
Tone Squelch of a distant station.
1. Press the CTCSS key. The CTCSS indicator will
light in the Display Panel.
2. Select the same Tone Frequency between the sta-
tions you wish to communicate. See Section 4-6-4
TONE OPERATION.
3. Press the microphone PTT switch.
4.To release the Tone Squelch function, press the
CTCSS key again. The CTCSS indicator should go
out on the Display Panel.
4-8. TRACE FUNCTION
This function allows you to change the frequency of
both the MAIN and the SUB band simultaneously.
Rotating the TUNING knob clockwise will cause the
frequency of the MAIN and SUB band to increase, and
rotating the knob counterclockwise will cause the fre-
quency to decrease.
4. Select the VFO mode for both the MAIN and SUB
bands.
2. Select the desired starting frequency for the MAIN
and SUB bands.
Caution:
This function requires that you must select the
same mode and frequency step for both bands for
proper operation.
3. Press the F and then the SPLIT key.
4. Turn the TUNING knob clockwise to increase and
counterclockwise to decrease the frequency of
both bands simultaneously.
5. To release the function, press the F and then the
SPLIT key again.