Yaesu VX-127, Руководство по эксплуатации

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VX-127 O
PERATING
M
ANUAL
23
CTCSS/DCS/EPCS O
PERATION
CTCSS O
PERATION
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
VX-127
, and is
very easy to activate.
CTCSS setup involves two actions: setting the Tone Mode and then setting of the Tone
Frequency. These actions are set up by Set mode.
1. Press the [ SET
( )
EMG
] key momentarily 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 so that “
TONE
” indication appears on the
display; this activates the CTCSS Encoder, for access to repeat-
ers requiring a CTCSS tone.
5. Rotation of the
DIAL
knob one more “click” in step “2” above
will cause the “
TSQL
” notation to appear. When “
TSQL
” is dis-
played, this means that the Tone SQueLch system is active, which
mutes your
VX-127
’s receiver until it receives a call from an-
other radio sending out a matching CTCSS tone. This can help keep your radio quiet
until a specific call is received, which 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 VX-127’s receiver (instead of opening
the squelch) when it receives a call from the 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” and “ECS” indications on the display while you rotate
the DIAL knob still more. We’ll discuss the Digital Code Squelch system (for “DCS”)
and Enhanced Paging & Code Squelch (for “ECS”) later.
6. When you have made your selection of the CTCSS tone mode, press the [
F
] key to
save the new setting.
7. Rotate the
DIAL
knob to select Set Mode Item 46:
TN FRQ
.
8. Press the [
F
] key momentarily to enable adjustment of the CTCSS
frequency.
9. Rotate the DIAL knob until the display indicates the Tone Fre-
quency you need to be using (ask the repeater owner/operator if
you don’t know the tone frequency).