Icom IC-7700

2-11
■ Microphone connector information
(Front panel view)
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.
2
INSTALLATION AND CONNECTIONS
[MIC]
FUNCTION DESCRIPTION
Pin No.
w +8VDCoutput Max.10mA
e
Frequency up Ground
Frequency down Ground through 470 Ω
r
Squelch open “Low” level
Squelch closed “High” level
y GND (PTT ground)
t PTT
r Squelch switch
q Microphone input
w +8 V DC output
e Frequency up/down
u GND
(Microphone ground)
i AF output (varies with [AF])
D HM-36
w
q
q PTT SWITCH
Hold down to transmit; release to receive.
w UP/DOWN SWITCHES [UP]/[DN]
Change the selected readout frequency or memory
channel.
 •Holding down continuously changes the frequency or
memory channel number.
 •Whileholdingdown[XFC],thetransmitreadoutfrequen-
cy can be controlled while in the split frequency mode.
 •The[UP]/[DN]switchcansimulateakeypaddle.Preset
in the keyer set mode. (p. 4-12)