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FT-257 OperaTing Manual 17
CTCSS/DCS Operation
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-257
,
and is very easy to activate.
1. Press the
[
SET/ATS
]
key to enter the Set mode.
2. Rotate the
DIAL
knob or press the
[
p
]
/
[
q
]
key to select
Set Mode Item 40:
SQL
.TYP.
3. Press the
[
SET/ATS
]
key momentarily to enable adjust-
ment of this Item.
4. Rotate the
DIAL
knob or press the
[
p
]
/
[
q
]
key so that
TONE
indication appears on the display; this activates
the CTCSS Encoder, for access to repeaters requiring a
CTCSS tone.
5. Rotation of the
DIAL
knob one more “click” or pressing
the
[
p
]
/
[
q
]
key one more “press” in step “4” above will
cause the
TSQL
notation to appear. When
TSQL
is
displayed, this means that the Tone Squelch system is ac-
tive and will mute the
FT-257
receiver until it receives a call from another radio that
is sending a matching CTCSS tone. This can help keep your radio quiet until a spe-
cic call is received; this may be helpful while operating in congested areas of the
band.
1) You may notice a “REV TN” indication on the display while you rotate the
DIAL knob in this step; this means that the Reverse Tone Squelch system is
active, which mutes your FT-257’s receiver (instead of opening the squelch)
when it receives a call from any radio sending a matched CTCSS tone. The
” icon will blink on the display when the Reverse Tone Squelch system is
activated.
2) You may notice the “DCS” indications on the display while you rotate the
DIAL knob still more. We’ll discuss the Digital Code Squelch system (DCS)
later.
6. When you have made your selection of the CTCSS tone mode, press the
PTT
switch
to save the new setting.
7. Press the
[
SET/ATS
]
key to enter the Set mode.
8. Rotate the
DIAL
knob or press the
[
p
]
/
[
q
]
key to select
Set Mode Item 42:
TN FRQ
.
9. Press the
[
SET/ATS
]
key momentarily to enable adjust-
ment of this Item.
honbun_130313.indd 17 2013/03/13 20:29:55
19


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