Microphone (Hm-36); Panel Description - Icom IC-78 Instruction Manual

n 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.
• HM-36 SCHEMATIC DIAGRAM
Microphone
22 kø
+
0.33 µF
4700 pF
MIC 1 kø
+
10 µF
ELEMENT
DOWN UP
PTT
RECEIVE
470 ø
TRANSMIT
• MICROPHONE CONNECTOR
(Front view)
i Main readout AF output
q Microphone input
w +8 V DC output
e Frequency up/down
r Main readout squelch switch
[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.
Microphone Plug
Microphone Cable
q u
w i y
e t
r

PANEL DESCRIPTION

(varies with [AF])
u GND
(Microphone ground)
y GND (PTT ground)
t PTT
DESCRIPTION
Max. 10 mA
Ground
Ground through 470 Ω
"Low" level
"High" level
2
7