Icom IC-751A - Rtty Operation

(2)
FM TRANSMITTING
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.
(3)
FM
REPEATER
OPERATION
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.
Install the encoder in the
location shown in
SECTION
10
OPTIONS
INSTALLATION.
Connect the 3-pin connector 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.
NOTE:
The
UT-30 was
preset
with an 88.5Hz
tone.
Change the UT-30 programming
if
a
different frequency is required.
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. In addition,
the
FUNCTION
INDICATOR
lights.
6-7
RTTY
OPERATION
(1)
RTTY
UNIT
CONNECTIONS
(2)
RTTY
RECEIVING
JIH14JMM
AM
nffil
cw
SSB
E13
RTTY
EQ3
*
Q
!
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-751 A.
Refer
to
SECTION 5
-
4
RTTY
TERMINAL
UNIT
for system
interconnections
and
further
information.
Audio signals
for the
demodulator
may
be
taken
from pin 4
of the
ACC
SOCKET
on the rear
panel of the IC-751 A,
or
from the
PHONES
JACK on the
front
panel.
The
level of the
audio
signals
from
the ACC
SOCKET
does not
vary when
adjusting
the
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
controls
and switches the same as
for SSB
recep-
tion.
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29
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