Icom IC-746 Instruction Manual

• When using a high speed relay
• When using a level converter
73
12
SETUP AND CONNECTIONS
12-8 RTTY connections
1
2
3
4
5
6
7
8
BREAK SWITCH
SELECTOR
MAGNETS
RTTY
DEMODULATOR
(TU)
LOOP CURRENT
POWER SUPPLY
1RTTY
5AF
2GND
AF
POLAR
RELAY
60 mA or 20 mA LOOP
TTY
MACHINE
ACC(1) SOCKET
1
2
3
4
5
6
7
8
BREAK SWITCH
SELECTOR
MAGNETS
RTTY
DEMODULATOR
LOOP CURRENT
POWER SUPPLY
1RTTY
5AF
2GND
AF
60 mA or 20 mA LOOP
TTY
MACHINE
ACC(1) SOCKET
PHOTO
COUPLER
+5 V
LEVEL CONVERTER
When operating RTTY, a teletype and demodulator,
etc. must be connected as in the diagrams below. The
demodulator operates via audio input with a receive
tone of 2125 Hz (or 1275 or 1615) and a shift offset of
170 Hz (or 200 or 425 Hz). See p. 29 for details on how
to change the receive tone or shift offset.

Icom IC-746 Specifications

General

Mode	SSB, CW, RTTY, AM, FM
Receiver Type	Double conversion superheterodyne
Antenna Connector	SO-239
Voltage	13.8 V DC ±15%
Impedance	50 ohms
Output Power	100 W (SSB, CW, FM, RTTY), 40 W (AM)
Current Drain	TX: 20 A
Sensitivity	AM: 2 µV
Selectivity	CW: 500 Hz (-6 dB)