Microphone Connector Information; Microphones (Options) - Icom IC-7700 Instruction Manual

2
INSTALLATION AND CONNECTIONS

■ Microphone connector information

(Front panel view)
q Microphone input
w +8 V DC output
e Frequency up/down

■ Microphones (options)

D SM-20
q
w
D HM-36
q
w
i AF output (varies with [AF])
u GND
(Microphone ground)
y GND (PTT ground)
t PTT
r Squelch switch
e
[MIC]
FUNCTION
Pin No.
w
+8 V DC output
Frequency up
e
Frequency down
Squelch open
r
Squelch closed
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 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. (p. 4-12)
w PTT SWITCH
Push and hold to transmit; release to receive.
e PTT LOCK SWITCH (available for SM-20 only)
Push to toggle between transmit and receive.
2-10
DESCRIPTION
Max. 10 mA
Ground
Ground through 470 Ω
"Low" level
"High" level