Operation Manual

FT-252 OperaTing Manual18
10. Rotate the
DIAL
knob until the display indicates the Tone Frequency required by the
repeater you are using (if you don’t know the tone frequency, ask the repeater owner/
operator).
11. When you have made your selection,
press the
[
SET/ATS
]
key, then press
the
PTT
switch to save the new set-
tings and exit to normal operation. This
is different than the usual method of
restoring normal operation, and it ap-
plies only to the configuration of the
CTCSS/DCS frequencies.
Your repeater may or may not re-transmit a CTCSS tone - some systems just use
CTCSS to control access to the repeater, but don’t pass it along when transmitting. If
the S-Meter deects, but the FT-252 is not passing audio, repeat steps “1” through “4”
above, but rotate the DIAL so that “TSQ” disappears - this will allow you to hear all
trafc on the channel being utilized.
DCS Operation
Another form of tone access control is Digital Code Squelch, or DCS. It is a newer,
more advanced tone system which generally provides more immunity from false pag-
ing than does CTCSS. The DCS Encoder/Decoder is built into your
FT-252
, and op-
eration is very similar to that just described for CTCSS. Your repeater system may be
congured for DCS; if not, DCS is frequently quite useful in Simplex operation if your
friend(s) use transceivers equipped with this advanced feature.
Just as in CTCSS operation, DCS requires that you set the Tone Mode to DCS and
that you select a tone code.
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
“
DCS
” indication appears on the display; this activates the
DCS Encoder/Decoder.
5. Press the
PTT
switch to save the new setting.
6. Press the
[
SET/ATS
]
key to enter the Set mode.
7. Rotate the
DIAL
knob or press the
[
p
]
/
[
q
]
key to select Set Mode Item 13:
DCS.COD
.
8. Press the
[
SET/ATS
]
key momentarily to enable adjustment of this Item.
CTCSS Operation
CTCSS/DCS Operation
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 – – – –
honbun_130313.indd 18 2013/03/13 19:47:49