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28 FT-7800R OPERATING MANUAL
CTCSS TONE FREQUENCY
(
Hz
)
67.0 69.3 71.9 74.4 77.0 79.7
82.5 85.4 88.5 91.5 94.8 97.4
100.0 103.5 107.2 110.9 114.8 118.8
123.0 127.3 131.8 136.5 141.3 146.2
151.4 156.7 159.8 162.2 165.5 167.9
171.3 173.8 177.3 179.9 183.5 186.2
189.9 192.8 196.6 199.5 203.5 206.5
210.7 218.1 225.7 229.1 233.6 241.8
250.3 254.1 ––––
CTCSS OPERATION
Many repeater systems require that a very-low-frequency audio tone be superimposed on
your FM carrier in order to activate the repeater. This helps prevent false activation of the
repeater by radar or spurious signals from other transmitters. This tone system, called
“CTCSS” (Continuous Tone Coded Squelch System), is included in your FT-7800R, and is
very easy to activate.
CTCSS setup involves two actions: setting the Tone Mode and then setting of the
Tone Frequency. These actions are set up by using the [TONE(REV)] key and Set
mode #44 (TN FRQ).
1. Press the
[
TONE
(
REV
)]
key several times, so that
ENC” appears on the display; this activates the CTCSS
Encoder, which allows repeater access.
1) You may notice an additional “DCS” icon appearing while you press the
[
TONE
(
REV
)]
key in this step. We’ll discuss the Digital Code Squelch system
shortly.
2) You may notice the “REV TN” indication on the display; this means that the Re-
verse Tone Squelch system is active, which mutes your FT-7800Rs receiver when it
receives a call from the radio sending a matched CTCSS tone. The “DEC” icon will
blink on the display when the Reverse Tone Squelch system is activated.
2. Pressing the
[
TONE
(
REV
)]
key once more in above step will cause “ENC DEC” to
appear. When “ENC DEC” appears, this means that the Tone Squelch system is active,
which mutes your FT-7800Rs receiver until it receives
a call from another radio sending out a matching CTCSS
tone. This can help keep your radio quiet until a specific
call is received, which may be helpful while operating in congested areas.
3. When you have made your selection of the CTCSS tone
mode, press and hold in the
[
BAND
(
SET
)]
key for 1/2
second to enter the Set mode, then rotate the DIAL knob
to select Menu #44 (TN FRQ). This Menu selection allows setting of the CTCSS tone
frequency to be used.
4. Press the
[
BAND
(
SET
)]
key momentarily
to enable adjustment of the CTCSS fre-
quency.
5. Rotate the
DIAL knob
until the
display indicates the Tone Frequency you
need to be using.
6. When you have made your selection, press
CTCSS/DCS OPERATION
30


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