Icom IC-718 Instruction Manual - Page 10

Microphone HM-36

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2 PANEL DESCRIPTION s Microphone (HM-36) q w q UP/DOWN SWITCHES [UP]/[DN] Change the selected readout frequency or memory channel. • Continuous pushing changes the frequency or memory channel number continuously. • The [UP]/[DN] switch can simulate a key paddle. Preset in the CW PADDL in initial set mode. (p. 31) w PTT SWITCH Push and hold to transmit; release to receive. • MICROPHONE CONNECTOR (Front view) q Microphone input w +8 V DC output e Frequency up/down i Main readout AF output (varies with [AF]/[BAL]) u GND (Microphone ground) y GND (PTT ground) t PTT r Main readout squelch switch [MIC] PIN NO. w FUNCTION +8 V DC output Frequency up e Frequency down Squelch open r Squelch closed DESCRIPTION Max. 10 mA Ground Ground through 470 Ω "LOW" level "HIGH" level CAUTION: DO NOT short pin 2 to ground as this can damage the internal 8 V regulator. • HM-36 SCHEMATIC DIAGRAM MICROPHONE MICROPHONE CABLE MICROPHONE PLUG MIC ELEMENT + 10µ 2k 4700p + 0.33µ 4700p DOWN UP qu wiy ert PTT RECEIVE 470 TRANSMIT 8

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8
2
PANEL DESCRIPTION
■
Microphone (HM-36)
q
UP/DOWN SWITCHES [UP]/[DN]
Change the selected readout frequency or memory
channel.
•Continuous pushing changes the frequency or memory
channel number continuously.
•The [UP]/[DN] switch can simulate a key paddle. Preset
in the CW PADDL in initial set mode. (p. 31)
w
PTT SWITCH
Push and hold to transmit; release to receive.
q
w
•MICROPHONE CONNECTOR
(Front view)
CAUTION:
DO NOT
short pin 2 to ground as this
can damage the internal 8 V regulator.
y
GND (PTT ground)
t
PTT
r
Main readout squelch switch
q
Microphone input
w
+8 V DC output
e
Frequency up/down
u
GND
(Microphone ground)
i
Main readout AF output
(varies with [AF]/[BAL])
Max. 10 mA
Ground
Ground through 470
Ω
“LOW” level
“HIGH” level
+8 V DC output
Frequency up
Frequency down
Squelch open
Squelch closed
[MIC]
PIN NO.
w
e
r
FUNCTION
DESCRIPTION
•HM-36 SCHEMATIC DIAGRAM
+
+
q
w
e
r
t
y
u
i
4700p
4700p
10
µ
0.33
µ
MICROPHONE
MIC
ELEMENT
2k
470
DOWN
UP
PTT
RECEIVE
TRANSMIT
MICROPHONE CABLE
MICROPHONE PLUG