Connectinga Linear Amplifier; Connecting Terminal; Mic Connector - Icom IC-475H Instruction Manual

5-2 CONNECTING A LINEAR
AMPLIFIER
ACC(1)
The 1C-475H is designed to operate into a load with a 50€) im-
pedance. Any amplifier used should have a 500 input impedance
for best efficiency.
1) Pin 3 (SEND) is grounded when the transceiver is in transmit
mode and opens when the transceiver returns to receive mode.
The output condition of pin 3 controls either the transmit or
receive function of the transceiver.
Specification for the keying rate is 20V DC maximum. DO NOT
exceed this limit. -
2) Pin 8 of the ACC(1) SOCKET is an ALC input for the Automatic
Level Control signal.from an external amplifier.
9 Operation with an external linear amplifier
To IN of
LINEAR
AMPLIFIER
22201 То [ANTI of
| 1C-475H
1C-475H
5-3 CONNECTING АМ
TERMINAL UNIT
* Using the ACC(1) SOCKET
е Using the MIC CONNECTOR
AFSK
оо@ © 90
опоопое
(Rear pane} view)
ALC
АСС(1) Pin8— |
АСС(1) Pin 3—
SEND LINEAR AMPLIFIER
When operating ап AFSK such as RTTY, AMTOR or PACKET,
connect the ACC(1) SOCKET as in the diagram below:
AF input
SQUELCH input
PTT
Ground (GND)
AFSK TERMINAL UNIT
(Front panel view)
5-4 MIC CONNECTOR INFORMATION
ФАЕ OUTPUT
(DMIC INPUT @GND (Microphone ground)
(8 FREQ UP/DOWN @PTT
(4) SQUELCH SWITCH
(Front panel view)
— 15 —