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CONTINUOUS
TONE
CODED
SQUELCH
SYSTEM
(CTCSS)
The CTCSS function is available only when the TSU-8
CTCSS unit is installed. The U.S.A./ Canada version is
supplied with the TSU-8 already installed.
CTCSS functions by using a subaudible tone that is
superimposed by a transmitter
on
a transmitted signal
to
control a receiver's squelch. When used in
combination with the noise squelch, CTCSS provides a
simple method to selectively choose which stations will
be
heard. This dual bander offers a total of
38 standardized CTCSS frequencies. Monitoring
is
less
tiring when using CTCSS since you hear only those
stations on a particular frequency that are transmitting
the Tone that you have selected.
SELECTING
CrCSS
FREQUENCIES
Refer to the chart of frequencies available and the
procedure for selecting the desired frequency on
page 34. The TH-79E cannot use 1750 Hz for CTCSS
operation.
@
88.5Hz
USING
cress
1 Press [BAND]
to
select the Operating band.
2 Press
[F], [CTCSS].
1111
CT
CD
·[
.:.1
.•
1.
q 1
~')
0
't
"1
Ill N
ooO
440.
l~ii3U
• Although "CT" appears even if the TSU-8
is
not
installed, CTCSS will not function.
After switching ON the CTCSS function, the squelch will
not open until a signal
is
received that has the selected
CTCSS Tone superimposed
on
the signal. If CTCSS
and Tone Alert are ON, there is no speaker output
except the alarm tone even if a signal
is
received with
the correct Tone.
Note: When using DTSS or Page with CTCSS, the squelch opens
only
if
the correct CTCSS tone is received
and
the received DTSS
or
Page code matches
the
code stored in your dual bander.
TH-79E: Selecting
1750Hz
inhibits CTCSS operation. In addition,
selecting 1750Hz switches the CTCSS function OFF automatically
if
this function is ON at the time. As soon as any Tone frequency other
than 1750 Hz
is
selected, the previous CTCSS status (ON
or
OFF)
is
restored.
47
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