Icom IC-471H Instruction Manual page 21

5-7 ЕМ OPERATION
5-7-1 RECEIVING
For FM reception, push the FM mode switch. Set other
switches and knobs the same as for SSB reception.
Turn the AF GAIN control clockwise to a comfortable
audio level.
If no signal can be heard but only noise, turn the
SQUELCH control clockwise until the noise from the
speaker stops and set it just beyond this threshold. When
adjusting the SOUELCH control setting, if some com-
munication signals can be heard, turn the tuning control
either direction and set it where only noise can be heard.
Your transceiver will now remain silent until an incoming
signal is received, which opens squelch and lights the
RECEIVE indicator.
If the squelch is unstable due to the reception of weak
signals or mobile stations, adjust the SQUELCH control
further unti! the proper threshold is obtained.
When the METER switch is in OUT position, the METER
functions as an S-meter, indicates signal strength of incom-
ing signals, and is caliblated in S units and dB over S9.
When the METER switch is pushed in, the METER func-
tions as a discriminator meter and indicates offset fre-
quency of an incoming signal.
The NOISE BLANKER and AGC circuits do not function
in this mode.
For tuning, memory channel operation and scanning opera-
tion, please refer to 5 - 1 HOW TO TUNE on page 9,
5 - 2 MEMORY CHANNEL OPERATION on page 14 and
5-4 SCANNING OPERATION on page 16.
5-7-2 TRANSMITTING
Set the MIC GAIN and RF POWER controls as follows.
MIC GAIN CONTROL : CENTER (12 o'clock) position
RF POWER CONTROL Completely counterclockwise
Set other knobs and switches the same as for receiving.
Turn the T/R switch to TRANSMIT or push the PTT
(Push-To-Talk) switch on the microphone and the tran-
sceiver will transmit. At the same time the TRANSMIT
indicator will be illuminated and the meter will indicate
relative power output of the transmitter.
Turn the RF POWER control while watching the meter
needle and set for desired output power. The output
power is adjustable between 10 watts and 75 watts in this
mode.
Now speak into the microphone the same as SSB transmitt-
ing. The VOX circuit does not function in this mode.
For DUPLEX (repeater) operation, push the "—DUP" or
"+DUP" button according to repeater's input/output
frequencies. When the IC-471H is first turned ON, the
OFFSET frequency will be preset 7.6MHz (U.S.A. version:
5.0MHz). This is the normal repeater input/output fre-
quency separation. For more detail, refer to 5 - 1 - 9 +DU-
PLEX AND —DUPLEX BUTTONS (DUPLEX OPERA-
TION) on page 12.
Ifyou desire to operate a repeater that has a frequency
difference other than 7.6MHz (U.S.A. version: 5.0MHz),
reset the OFFSET frequency to desired one. Refer to
5 - 1- 10 RESETTING THE OFFSET FREQUENCY on
page 12.
If you need a tone-burst for initial access of the repeater,
depress the TONE ENCODER switch on the front panel for
the required period. (Tone-burst periods vary individually
between 100 milliseconds and 2 seconds.) (European
version only)
5-7-3 SUBAUDIBLE TONE ENCODER/DECODER
An optional subaudible tone encoder/decoder can be
installed into the set (U.S.A. version is equipped with a
subaudible tone encoder.)
When the encoder/decoder has been installed, by pushing
the TONE ENCODER switch, the TONE ENCODER
INDICATOR is illuminated and the encoder/decoder is
activated. By depressing the TONE SELECT button, the
tone number is displayed on the frequency display and it
(tone frequency) can be selected by turning the TUNING
CONTROL.
When the tone number is between 1 and 31, the encoder/
decoder functions as a CTCSS (Coded Tone Control
Squelch System), and between 32 and 63, it functions as a
subaudible tone encoder. Their frequencies are as follows:
ТОМЕ | - < На | TONE 2
NO. NO
ae OPTIONAL "m OPTIONAL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
N —
NOTE: The original subaudible tone encoder of the
U.S.A. version has frequencies as shown. When
the optional encoder/decoder is installed into the
set, the original encoder is disconnected from the
circuit and only the encoder/decoder newly
installed is activated.
— 19 —