Microphones; D Hm-36; D Sm-20; Panel Description - Icom IC-7200 Instruction Manual

1

PANEL DESCRIPTION

■ Microphones

D HM-36

D SM-20

(Option)
• MICROPHONE CONNECTOR
(Front view)
q Microphone input
w +8 V DC output
e Frequency up/down
• HM-36 SCHEMATIC DIAGRAM
11
q
w
q
w
e
i AF output
(varies with [AF])
u GND
(Microphone ground)
y GND (PTT ground)
t PTT
r Squelch switch
MICROPHONE
MIC
ELEMENT
DOWN
PTT
RECEIVE
TRANSMIT
q UP/DOWN SWITCHES [UP]/[DN]
Change the selected readout frequency or memory
channel.
• Pushing the switch continuously changes the frequency
or memory channel number continuously.
• The [UP]/[DN] switch can simulate a key paddle. Select
in set mode (U/D KEY; Mic Up/Down Keyer). (p. 80)
• While pushing and holding
switch to control the transmit readout frequency while
in spilt frequency operation.
* Available only when the XFC (transmit frequency
check) function is turned ON. (p. 76)
w PTT SWITCH
Push and hold to transmit; release to receive.
e PTT LOCK SWITCH (SM-20 only)
Push to lock the PTT switch to the transmission
codition.
[MIC]
PIN NO.
+8 V DC output
w
Frequency up
e
Frequency down
Squelch open
r
Squelch close
CAUTION:
this can damage the internal 8 V regulator. DC
voltage is applied to pin 1 for microphone opera-
tion. Use caution when using a non-Icom micro-
phone.
MICROPHONE CABLE MICROPHONE PLUG
2kø
+
0.33µF
4700pF
1kø
+
10µF
UP
470ø
*, push the [UP]/[DN]
RIT
FUNCTION DESCRIPTION
Max. 10 mA
Ground
Ground through 470 ˘
"LOW" level
"HIGH" level
DO NOT short pin 2 to ground as
q u
w i y
e t
r