Kenwood TH-27A - Manual (Page 33)

This function allows squelch to be turned on in receive
mode on reception of a three-digit code matching the
DTSS code selected in your radio.
Once squelch is turned on by reception of a matching
code, squelch operates normally from then on. If no
signal is received for longer than 2 seconds, squelch is
turned off until a matching code is received.
4-8. DTSS (Dual Tone Squelch System)
NOTE
This function is not available in some areas.
4-8-1. DTSS Code
DTSS codes from 000 through 999 can be stored in
memory channels, and CALL channel.
4-8-2. DTSS Code Selection
Press the F key for longer than 1 second. Press the DTSS
key while the F indicator is flashing (for 1 0 seconds). This
enters code selection mode. Then enter a three-digit
number on the key pad.
NOTES
1. If a key other than the numeric key is pressed dur­
ing operation, code selection mode is canceled.
2. If no action is taken for longer than 10 seconds,
code selection mode is automatically cancelled.
4-8-3. Using the DTSS function
1. Adjust the SQL control to the threshold point.
2. Press the DTSS key. The DT indicator will light.
3. RECEIVES;
Squelch will open when the proper code is received.
TRANSMISSION;
When the PTT switch is pressed, the code is sent out
for about 0.5 second.
NOTES
1. Voice output is muted during code output.
2. We recommend that you turn off the Battery
Saver function when you use the DTSS function.
4. To cancel the DTSS function press the DTSS key
again.
4-8-4. Using DTSS with a Repeater
The DTSS signal is transmitted after a short delay if the
PTT switch is pressed. This is to avoid any malfunction
due to the DTSS signal being interrupted by repeaters
with long response times.
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