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VX-120 OPERATING MANUAL24
7. When you have made your selection, press
the
[
F
]
key momentarily, then press the
PTT switch to save the new settings and
exit to normal operation. This is different
than the usual method of restoring nor-
mal operation, and it applies only to the
configuration of the CTCSS/DCS fre-
quencies.
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 deflects, but the VX-120 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 traffic 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 paging than
does CTCSS. The DCS Encoder/Decoder is built into your VX-120, and operation is very
similar to that just described for CTCSS. Your repeater system may be configured 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
[
F
]
key, then press the
[
LOW
(
LOCK
)
SET
]
key to enter the Set mode.
2. Rotate the DIAL knob to select Set Mode Item 44: SQL.TYP.
3. Press the
[
F
]
key momentarily to enable adjustment of this Item.
4. Rotate the DIAL knob until the “DCS” indication appears on the
display; this activates the DCS Encoder/Decoder.
5. Press the
[
F
]
key to save the new setting.
6. Rotate the DIAL knob to select Set Mode Item 13: DCS.COD.
7. Press the
[
F
]
key momentarily to enable adjustment of the DCS
code.
8. Rotate the DIAL knob to select the desired DCS Code (a three-
digit number). Ask the repeater owner/operator if you don’t know
DCS Code; if you are working simplex, just set up the DCS Code
to be the same as that used by your friend(s).
9. When you have made your selection, press the
[
F
]
key momen-
CTCSS OPERATION
CTCSS/DCS/EPCS 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
26


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