8 OTHER FUNCTIONS

Optional HM-75A functions

The optional HM-75A allows you to remotely select operating chan- nels, open the squelch, etc. The switches on the HM-75A function as follows.

CAUTION: When connecting the HM-75A to the transceiver, make sure that power to the transceiver is turned OFF, other- wise the transceiver may malfunction.

SWITCH

NORMAL

While holding [PTT]

 

 

 

A

Smart-Ring

No function

 

 

 

B

Open squelch

No function

 

 

 

UP

Change the oper-

 

 

ating

channel

Smart-Ring

 

number up.

 

 

 

 

DOWN

Change the oper-

 

 

ating

channel

Call-Ring

 

number down.

 

 

 

 

 

PTT switch

A

B

Lock switch:

 

 

 

Locks all

OFF

ON

 

 

LOCK

 

switches

 

 

 

except [PTT]

 

 

 

Earphone

jack

19

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Icom IC-4008E instruction manual ‘ Optional HM-75A functions, Switch Normal