2 INSTALLATION AND CONNECTIONS

Microphone connector information

(Front panel view)

 

i AF output (varies with [AF])

q Microphone input

u GND

 

 

(Microphone ground)

w+8 V DC output y GND (PTT ground)

e Frequency up/down

t PTT

r Squelch switch

[MIC]

FUNCTION

DESCRIPTION

Pin No.

 

 

w

+8 V DC output

Max. 10 mA

 

 

 

 

Frequency up

Ground

e

 

 

Frequency down

Ground through 470 Ω

 

 

 

 

r

Squelch open

“Low” level

 

 

Squelch closed

“High” level

 

 

 

 

CAUTION: DO NOT short pin 2 to ground as this

can damage the internal 8 V regulator.

NOTE: DC voltage is applied to pin 1 for micro-

phone operation. Use caution when using a non- Icom microphone.

Microphones (options)DSM-20

q

w

e

DHM-36

q

qUP/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)

wPTT SWITCH

Push and hold to transmit; release to receive.

ePTT LOCK SWITCH (available for SM-20 only) Push to toggle between transmit and receive.

w

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