Yaesu FT-847, Руководство по эксплуатации

Страница: 55 / 108

53
FT-847 O
PERATING
M
ANUAL
OPERATION
FM T
RANSMISSION
Repeater Shift Reversal Feature
While operating on a repeater, you may wish to re-
verse your receive and transmit frequencies, so as to
listen for the other station’s
direct signal.
This allows you to determine if communication is pos-
sible with the other station without using the repeater
(i.e. “simplex”).
To do this, press the [
2
(
REV
)] key. To
return to normal repeater operation,
press the [
2 ( REV )] key once more.
1750 Hz Tone Call Repeater Access
Particularly in the European market, repeater access
may require that you send a brief transmission con-
taining a 1750 Hz tone superimposed on the carrier.
To do this, press the [
T. CALL
] key. The
transmitter will automatically be acti-
vated, and the 1750 Hz tone will be sent
out, to access the repeater.
Release the [
T. CALL
] key after the prescribed time,
then press the microphone’s [ PTT ] switch to begin
your conversation.
CTCSS Operation
The subaudible CTCSS (Continuous Tone Coded
Squelch System) circuitry includes the following com-
ponents, hereafter called Tone Modes:
r
The Encoder circuit, which superimposes a
subaudible tone onto your voice signal, for repeater
access or selective calling of other stations. When
the Encoder is activated, the “
ENC
” will appear on
the display.
r
The Decoder circuit, which will mute your
transceiver’s receiver audio unless an incoming sig-
nal containing a matching CTCSS signal is re-
ceived. When the Decoder is activated, both the
“
ENC
” and “
DEC
” icons will appear.
To activate the Encoder, press the
[
3
(
TONE
)] key once. To activate the
Decoder, press the [
3
(
TONE
)] key
again. A third press of this key activates
the DCS system (see next page).
In addition to the Tone Mode, one must be aware of
the need to set the correct CTCSS Tone Frequency, as
highly-selective audio filters at a repeater site will
cause the repeater not to respond to your call if you
are using the wrong Tone Frequency. A total of 39
internationally-recognized CTCSS tones are provided
on the FT-847.
The CTCSS Tone Frequency is set using Menu #12.
For example, to set a CTCSS Tone Frequency of 103.5
Hz, use the following procedure:
l
Press the [ MENU ] button to activate the Menu
mode of operation.
l
Rotate the SUB-TUNE knob to select Menu #12
(“
TONE-FRQ
”).
l
Rotate the
MEM/VFO CH
knob to set the value to
103.5 Hz.
l
Press the [ MENU ] key to exit the Menu mode.
To summarize:
l
First set the Tone Mode, using the [
3
(
TONE
)] key.
l
Next set the Tone Frequency, using Menu #12.
After completing these steps, and setting the repeater
shift, if applicable, you will probably want to store
this data into a memory register. See page 71 for de-
tails on how to do this.
CTCSS T
ON E
F
REQU ENCY
(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
151.4 156.7 162.2 167.9 173.8 179.9 186.2 192.8
203.5 210.7 218.1 225.7 233.6 241.8 250.3 -
R
EPEATER
O
PERATION