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2
INSTALLATION AND CONNECTIONS
2
External antenna tuner connection
CONNECTING THE AH-4/AH-3
The AH-4 or AH-3 must be connected to [ANT1].
Coaxial cable (from the AH-4 or AH-3)
ANT1
Control cable
Transceiver
Ground
AH-4 or AH-3
Long wire or optional AH-2b
(Front panel view)
CAUTION: DO NOT short pin 2 to ground as this
can damage the internal 8 V regulator.
NOTE: DC voltage is applied to pin 1 for micro-
phone operation. Take care when using a non-Icom
microphone.
y GND (PTT ground)
t PTT
r Main readout squelch switch
q Microphone input
w +8 V DC output
e Frequency up/down
u GND
(Microphone ground)
i Main readout AF output
(varies with [AF]/[BAL])
[MIC]
FUNCTION DESCRIPTION
Pin No.
w +8 V DC output Max. 10 mA
e
Frequency up Ground
Frequency down Ground through 470
r
Squelch open “Low” level
Squelch closed “High” level
Microphone connector information
When 2 to 13.8 V is applied to pin 6 of [ACC(2)], the
[XVERT] jack is activated for transverter operation
and the antenna connectors do not receive or trans-
mit any signals. (p. 20)
While receiving, the [XVERT] jack can be activated
as an input terminal from an external transverter.
While transmitting, the [XVERT] jack outputs signals
of the displayed frequency at –20 dBm (22 mV) as
signals for the external transverter.
Transverter jack
Transverter jack information
23


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