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INSTALLATION AND CONNECTIONS
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■
Microphone connector information
(Front panel view)
y
GND (PTT ground)
t
PTT
r
Squelch switch
q
Microphone input
w
+8 V DC output
e
Frequency up/down
i
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
“High” level
CAUTION: DO NOT
short pin 2 to ground as this
can damage the internal 8 V regulator. A DC volt-
age 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]
Push to change the frequency or memory channel.
• While holding down, the frequency or memory channel
number continuously increases or decreases.
• While in the split frequency mode, and holding down
[XFC], push to change the transmit frequency.
• The [UP]/[DN] switch can be used as a key paddle if
the “MIC Up/Down Keyer” item is set to “ON” in the
Keyer Set mode. In such case, the frequency and mem-
ory channel cannot be changed using the [UP]/[DN]
switches. (p. 43)
• You can set t
he dot-dash polarity of the
[UP]/[DN]
switch in the “Paddle Polarity” item in the Keyer Set
mode. When “Normal” is selected, [UP] sends a dash,
and [DN] sends a dot.
w
PTT SWITCH
Hold down to transmit; release to receive.
e
PTT LOCK SWITCH
(available on only the SM-50)
Push to toggle between transmit and receive.
r
LOW CUT SWITCH
(available on only the SM-50)
Push to cut out the low frequency components of
input voice signals.