Icom IC-78 Instruction Manual - Page 9

Microphone HM-36

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2 PANEL DESCRIPTION s Microphone (HM-36) • DESCRIPTION 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. 32) w PTT SWITCH Push and hold to transmit; release to receive. • MICROPHONE CONNECTOR (Front view) i Main readout AF output (varies with [AF]) q Microphone input w +8 V DC output u GND (Microphone ground) y GND (PTT ground) e Frequency up/down t PTT r Main readout squelch switch [MIC] Pin No. FUNCTION w +8 V DC output e Frequency up Frequency down r Squelch open 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 + 10 µ 2 k 4700 p + 0.33 µ 4700 p DOWN UP qu wiy ert PTT RECEIVE 470 TRANSMIT 7

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7
2
PANEL DESCRIPTION
■
Microphone (HM-36)
•DESCRIPTION
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. 32)
w
PTT SWITCH
Push and hold to transmit; release to receive.
•MICROPHONE CONNECTOR
(Front view)
CAUTION:
DO NOT
short pin 2 to ground as this
can damage the internal 8 V regulator.
q
w
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])
•HM-36 SCHEMATIC DIAGRAM
+
+
q
w
e
r
t
y
u
i
4700 p
4700 p
10
μ
0.33
μ
MICROPHONE
MIC
ELEMENT
2 k
470
DOWN
UP
PTT
RECEIVE
TRANSMIT
MICROPHONE CABLE
MICROPHONE PLUG
[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