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5-4
RTTY TERMINAL
UNIT
When
operating
RTTY,
connect
the
ACC CONNECTOR
pin
9 and
pin
8
(ground)
via a
high
speed
relay
or
through
a level
converter
for
conversion to
TTL
level
to
your
teletypewriter.
The
audio tones
for
your
terminal
are available
from
pin
4 and
pin
8
(ground).
The
AF
output
level
is
about
300mVp-p
for
an
S9
signal.
•USING
A
HIGH SPEED
RELAY
•USING
A
LEVEL
CONVERTER
•
USING
AN
AFSK GENERATOR
•
An
RTTY
Terminal Unit
for
AFSK
operation can
also
be con-
nected
easily.
NOTE: Some
RTTY
Terminal
Units
may
require
the use of
a
20dB
audio
preamplifier
between
pin
5 on
the
ACC
SOCKET
and
the
AFSK
signal
output
from
the Terminal
Unit to provide
enough
drive for
full
RF
output
power
from
the
transceiver.
The
pin
5
input
must
be approxi-
mately
150mV
rms.
Check your
RTTY
Terminal Unit
Instruction
Manual.
•
The
AFSK
signal
may
be
connected
to the
IC-751A
front panel
MIC
CONNECTOR
pin
1
instead of
the
ACC CONNECTOR
if
the
Terminal
Unit
output
is
not
high
enough.
An
extra stage
of
amplification
is
provided
in
the
transceiver
when
using the micro-
phone
connector.
-
20
-
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