2
INSTALLATION AND CONNECTIONS
Microphone connector information
(Front panel view)
q Microphone input
w +8 V DC output
e Frequency up/down
Microphones
D HM-36
D SM-50
(option)
23
i Main readout AF output
(varies with [AF])
u
GND
(Microphone ground)
y GND (PTT ground)
t PTT
r Main readout squelch switch
q
w
q
r
w
[MIC]
Pin No.
w
e
r
CAUTION: DO NOT
can damage the internal 8 V regulator. DC voltage is
applied to pin 1 for microphone operation. Use cau-
tion when using a non-Icom microphone.
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.
w PTT SWITCH
Push and hold to transmit; release to receive.
e PTT LOCK SWITCH (available for SM-50 only)
Push to toggle between transmit and receive.
r LOW CUT SWITCH (available for SM-50 only)
Push to cut out the low frequency components of
input voice signals.
e
FUNCTION
DESCRIPTION
+8 V DC output
Max. 10 mA
Frequency up
Ground
Ground through 470 ˘
Frequency down
Squelch open
"Low" level
Squelch closed
"High" level
short pin 2 to ground as this
(p. ??)
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