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Microphone connector information
(Front panel view)
y GND (PTT ground)
t PTT
r Main readout squelch switch
q Microphone input
w +8 V DC output
e Frequency up/down
i Main readout AF output
(varies with [AF])
GND
(Microphone ground)
u
[MIC]
Pin No.
FUNCTION DESCRIPTION
w
+8
V DC output Max. 10 mA
e
Frequency up Ground
Frequency down Ground through 470
˘
r
Squelch open “Low” level
Squelch closed “H
igh” level
CAUTION: DO NOT short pin 2 to ground as this
can damage the internal 8 V regulator. DC voltage
is applied to pin 1 for microphone operation. Use
caution when using a non-Icom microphone.
Microphones
D HM-36
q
w
q
w
r
e
D SM-50 (Option)
q
w
q
w
r
e
q UP/DOWN SWITCHES [UP]/[DN]
Change the selected readout frequency or memory
channel.
Pressing a switch continuously changes the frequency
or memory channel number continuously.
While pushing [XFC], the transmit readout frequency
can be controlled while in split frequency operation.
The [UP]/[DN] switch can simulate a key paddle. Preset
in the keyer set mode. (p. 45)
w PTT SWITCH
Push and hold to transmit; release to receive.
e PTT LOCK SWITCH (a
vailable for SM-50 only)
Push to toggle between transmit and receive.
r LO
W CUT SWITCH (available for SM-50 only)
Push to cut out the low frequency components of
input voice signals.
23
2
INSTALLATION AND CONNECTIONS
30


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