Icom IC-751A Instruction Manual page 33

(2) FM TRANSMITTING
(3) FM REPEATER OPERATION
NOTE: The UT-30 was preset with an 88.5Hz
tone. Change the UT:.30 programming if
a different frequency is required.
6-7 RTTY OPERATION
(1) RTTY UNIT CONNECTIONS
(2) RTTY RECEIVING
D!mll&JI
AM
11!1
CW - SSB
IDI
RTTYlmil
D
11
u u 1111
1111 11
Transmitting an FM signal is essentially the same as for
SSB
trans-
mission.
1) Set the MIC GAIN CONTROL to the center position.
2) Select the transmit mode with either the T/R SWITCH or the
PTT SWITCH on the microphone.
3) Speak into the microphone in a normal voice. The meter needle
indicates the carrier power when the METER SWITCH is in the
Po position, however the meter does not move in time with your
voice modulation in this mode.
NOTE: Most countries only allow FM operation on 28MHz or
higher.
An 88.5Hz TDNE ENCODER is often required to access HF FM
repeaters. The optional UT-30 PROGRAMMABLE TONE
ENCODER is designed for this purpose.
lnstall the encoder in the location shown in SECTION 10 OPTIONS
INSTALLATION. Connect the 3-pin connecter from the encoder
onto J6 ("TONE" jack) on the MAIN unit.
1) When operating through repeaters, program the transmit and
receive frequencies in VFO A and VFO B.
Refer to SECTION 6 - 2 VFO A/B SELECTION for information
on using the two VFOs.
2) The encoder·tone is transmitted when the FUNCTION SWITCH
is pushed while transmitting. ln addition, the FUNCTION
INDICATOR lights.
NOTE: The FUNCTION INDICATOR lights when the FUNC·
TION SWITCH is pushed while transmitting even if the
UT-30 is not installed, however no tone is transmitted.
For RTTY operation, a teletypewriter or keyboard and a
demodulator (terminal unit) which is operational with audio input
are required.
Any demodulator designed for 170Hz narrow shift with
2125/
2295Hz filters may be used with the IC-751A.
Refer to SECTION 5 - 4 RTTY TERMINAL UNIT for system
interconnections and further information.
Audio signais for the demodulator may be taken from pin 4 of the
ACC SOCKET on the rear panel of the IC-751A, or from the
PHONES JACK on the front panel. The level of the audio signais
from the ACC SOCKET does not vary when adjustingthe AF GAIN
CONTROL, and the level is about 300mVp-p maximum.
1) Push the RTTY SWITCH to select the RTTY operating mode.
2) Set the other contrais and switches the same as for SSB recep-
tion.
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