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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-120/170, 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.
R.F. Says: 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/W] key, then press the [1(SQ TYP)] key to enable selection of the
CTCSS/DCS/ECS mode.
2.
Rotate the DIAL knob until the "DCS" indication appears on the display; this activates the
DCS Encoder/Decoder.
3.
Press the PTT key to save the new setting.
4.
Press the [F/W] key, then press the [2(CODE)] key to enable adjustment of the DCS
code.
5.
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).
6.
When you have made your selection, press the [F/W] key momentarily to save the new
settings and exit to normal operation.
R.F. Says: Remember that the DCS is an Encode/Decode system, so your receiver will
remain muted until a matching DCS code is received on an incoming transmission. Switch
the DCS off when you're just tuning around the band!
Tone Search Scanning
In operating situations where you don't know the CTCSS or DCS tone being used by another
station or stations, you can command the radio to listen to the incoming signal and scan in
search of the tone being used. Two things must be remembered in this regard:
You must be sure that your repeater uses the same tone type (CTCSS vs. DCS).
Some repeaters do not pass the CTCSS tone; you may have to listen to the station(s)
transmitting on the repeater uplink (input) frequency in order to allow Tone Search
Scanning to work.
To scan for the tone in use:
VX-120/170 O
18/64
FCC ID: K6620223X20
IC ID: 511B-20223X20
M
PERATING
ANUAL
Vertex Standard Co., Ltd.
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