Icom IC-7200 Instruction Manual - Page 16

■ Microphones, ◇ HM-36, ◇ SM-20(Option), CAUTION, SM-20

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1 PANEL DESCRIPTION ■ Microphones D HM-36 q w D SM-20 (Option) q w e 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. 81) • While pushing and holding RIT *, push the [UP]/[DN] 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. • MICROPHONE CONNECTOR (Front view) i 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 Squelch switch [MIC] PIN NO. FUNCTION w +8 V DC output e Frequency up Frequency down r Squelch open Squelch close DESCRIPTION Max. 10 mA Ground Ground through 470 ˘ "LOW" level "HIGH" level CAUTION: DO NOT short pin 2 to ground as this can damage the internal 8 V regulator. DC voltage is applied to pin 1 for microphone operation. Use caution when using a non-Icom microphone. • HM-36 SCHEMATIC DIAGRAM MICROPHONE 22kø + 0.22µF 4700pF MICROPHONE CABLE MICROPHONE PLUG MIC ELEMENT + 1kø 10µF DOWN UP qu wiy et r PTT RECEIVE TRANSMIT 470ø 11

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11
• MICROPHONE CONNECTOR
(Front view)
y
GND (PTT ground)
t
PTT
r
Squelch switch
q
Microphone input
w
+8 V DC output
e
Frequency up/down
i
AF output
(varies with [AF])
u
GND
(Microphone ground)
[MIC]
PIN NO.
FUNCTION
DESCRIPTION
w
+8 V DC output
Max. 10 mA
e
Frequency up
Ground
Frequency down
Ground through 470
˘
r
Squelch open
“LOW” level
Squelch close
“HIGH” level
CAUTION:
DO NOT
short pin 2 to ground as
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.
• HM-36 SCHEMATIC DIAGRAM
+
q
w
e
r
t
y
u
i
4700pF
0.22μF
MICROPHONE
MIC
ELEMENT
22k
ø
470
ø
DOWN
UP
PTT
RECEIVE
TRANSMIT
MICROPHONE CABLE
MICROPHONE PLUG
1k
ø
+
10μF
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. 81)
• While pushing and holding
RIT
*, push the [UP]/[DN]
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.
q
w
q
w
e
■
Microphones
D
HM-36
D
SM-20
(Option)
1
PANEL DESCRIPTION