Microphone (Hm-36) - Icom IC-78 Instruction Manual

Microphone (HM-36)

n
• DESCRIPTION
q
w
q UP/DOWN SWITCHES [UP]/[DN]
Change the selected frequency or Memory chan-
nel.
• Holding down continuously changes the
frequency or Memory channel number.
• The [UP]/[DN] switch can used as a paddle key.
Set in the CW PADDL of the Initial Set mode.
(p. 31)
w PTT SWITCH
Hold down to transmit, release to receive.
• HM-36 SCHEMATIC DIAGRAM
Microphone
22 kø
+
0.33 µF
4700 pF
1 kø
MIC +
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.
w
+8 V DC output
Frequency up
e
Frequency down
Squelch open
r
Squelch closed
CAUTION: DO NOT
can damage the internal 8 V regulator. DC voltage is
also applied to pin 1 for microphone operation. Use
caution when using a non-Icom microphone.
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
Maximum 10 mA
Ground
Ground through 470 Ω
"Low" level
"High" level
short pin 2 to ground as this
1
6