Microphone (Hm-36) - Icom IC-756 Instruction Manual

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.
- While pushing [XFC], the transmit readout frequency
can be controlled while in spilt frequency operation.
- The [UP]/[DN] switch can simulate a key paddle. Preset
in the keyer set mode. (p. 35)
• MICROPHONE CONNECTOR
(Front panel view)
i Main readout AF output
q Microphone input
w +8 V DC output
e Frequency up/down
r Main readout squelch switch
• HM-36 SCHEMATIC DIAGRAM
q
w
(varies with [AF]/[BAL])
u GND
(Microphone ground)
y GND (PTT ground)
t PTT
MICROPHONE
+ 2k
10 4700p
0.33
MIC
4700p
ELEMENT
DOWN
PTT
RECEIVE
470
TRANSMIT
w PTT SWITCH
Push and hold to transmit; release to receive.
PIN NO. FUNCTION
w
+8 V DC output
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 CABLE MICROPHONE PLUG
+
q
i
w
UP
e
r
PANEL DESCRIPTION
DESCRIPTION
Max. 10 mA
Ground
Ground through 470
"LOW" level
"HIGH" level
u
y
t
1
8