Microphone Connector Information; Microphones (Options) - Icom IC-7800 Instruction Manual

■ Microphone connector information

(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
• EXTERNAL KEYPAD connection
S4 S3 S2
(T4/M4/ (T3/M3/ (T2/M2/
PT4/RT4) PT3/RT3) PT2/RT2)
4.7 kΩ 2.2 kΩ 1.5 kΩ
±5% ±5% ±5%

■ Microphones (options)

D SM-20
q
w
D SM-50
q
r
w
D HM-36
q
w
(varies with [AF])
u GND
(Microphone ground)
y GND (PTT ground)
t PTT
To pin u
S1
(T1/M1/
PT1/RT1)
To pin e
1.5 kΩ
Microphone
±5%
connector
e
r
e
INSTALLATION AND CONNECTIONS
[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.
DC voltage is applied to pin 1 for microphone op-
eration. Use caution when using a non-Icom
microphone.
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 split frequency operation.
• The [UP]/[DN] switch can simulate a key paddle. Preset
in the keyer set mode. (p. 4-12)
w PTT SWITCH
Push and hold to transmit; release to receive.
e PTT LOCK SWITCH
(available for SM-20 and SM-50 only)
Push to toggle between transmit and receive.
r LOW CUT SWITCH
(available for SM-20 and SM-50 only)
Slide (SM-20)*/Push (SM-50) to cut out the low fre-
quency components of input voice signals.
*Slide switch is located at the bottom of the microphone.
2-9
2
DESCRIPTION
Max. 10 mA
Ground
Ground through 470 Ω
"Low" level
"High" level