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-50
q
D SM-30
q
D HM-36
q
i AF output (varies with [AF])
u GND
(Microphone ground)
y GND (PTT ground)
t PTT
r Squelch switch
r
e
w
w
r
e
[MIC]
FUNCTION
Pin No.
+8 V DC output
w
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
caution when using a non-Icom microphone.
q PTT SWITCH
Push and hold to transmit; release to receive.
w PTT LOCK SWITCH
(available for SM-30 and SM-50 only)
Push to toggle between transmit and receive.
e UP/DOWN SWITCHES [UP]/[DN]
(available for SM-50 and HM-36 only)
Change the selected readout frequency or memory
channel.
• Continuous pushing 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)
r LOW CUT SWITCH
(available for SM-30 and SM-50 only)
Slide (SM-30)*/Push (SM-50) to cut out the low
frequency components of input voice signals.
*Slide switch is located at the bottom of the microphone.
2-10
DESCRIPTION
Max. 10 mA
Ground
Ground through 470 Ω
"Low" level
"High" level