FCC ID: K6620223X20
IC ID: 511B-20223X20
VX-120/170 O
PERATING MANUAL
19/64
Vertex Standard Co., Ltd.
1. Set the radio up for either CTCSS or DCS Decoder operation (see the previous
discussions). In the case of CTCSS, “T SQ” will appear on the display; in the case of
DCS, “DCS” will appear on the display.
2. Press the [F/W] key, then press the [2(CODE)] key.
3. Press and hold in the [] or [] key for one second to start scanning for the incoming
CTCSS or DCS tone/code.
4. When the radio detects the correct tone or code, it will halt on that tone/code, and audio
will be allowed to pass. Press the [F/W] key to lock in that tone/code, then press the
[F/W] key again to exit to normal operation.
R.F. Says:
If the Tone Scan feature does not detect a tone or code, it will continue to scan
indefinitely. When this happens, it may be that the other station is not sending any tone. You
can press the PTT switch to halt the scan at any time.
You also can press the MONI key during Tone Scanning to listen to the (muted) signal from
the other station. When you release the MONI key, Tone Scanning will resume after about a
second.
Tone Scanning works either in the VFO or Memory modes.
EPCS (Enhanced Paging & Code Squelch)
The VX-120/170 includes an Enhanced CTCSS tone encoder/decoder and a dedicated
microprocessor providing paging and selective calling feature. This allows you to place a call
to a specific station (Paging), and to receive calls of your choice directed only to you (Code
Squelch).
The paging and code squelch systems use two pairs of (alternately switched) CTCSS tones
which are stored in the pager memories. Basically, your receiver remains silent until it
receives the CTCSS tone pair that matches those stored in the Receiving Pager Memory.
The squelch then opens so the caller is heard, and the paging ringer immediately sounds, if
activated. When you close the PTT switch to transmit, the CTCSS tone pair which is stored in
the Transmitting Pager Memory will be transmitted automatically.
On the paged radio, the squelch will close automatically after the incoming page ends.
Meanwhile, on the paging radio, the Enhanced Paging and Code Squelch system will be
disabled after the PTT key is released after the paging transmission. You may re-activate the
Enhanced Paging and Code Squelch system again using Set Mode Item 29: PAGER, if
desired.
Storing the CTCSS Tone Pairs for EPCS Operation
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