Icom IC-A4 Setting squelch level, Lock function, Display backlighting, Low battery indicator

3 BASIC OPERATION

■Setting squelch level

The transceiver has a noise squelch circuit to mute undesired noise while receiving no signal.

➥To open the squelch:

Push and hold [SQL] to open the squelch. This is useful to listen to weak signals that do not open the squelch.

-“BUSY” appears on the display.

➥To close the squelch:

Release [SQL] to close the squelch.

DSetting the squelch level

qWhile pushing [SQL], push [Y] or [Z] to select the squelch level.

-‘Sq 1’ is loose squelch and ‘Sq 9’ is tight squelch. (Initial level is 3.)

-‘oPEn’ indicates that the squelch circuit is turned off. w Release [SQL] to return to regular operation.

■Lock function

The lock function prevents accidental channel changes and accidental function access. [PTT] and [SQL] still function while the lock function is in use.

➥Push [ ] for 2 sec. to toggle the lock function ON and OFF.

■Display backlighting

Display backlighting automatically turns on when a key is pushed.

■Low battery indicator

Low battery indicator appears

when the battery power has de-

MR

When using an optional headset, such as those from the David Clark Co. via the OPC-752 HEAD SET ADAPTOR, the transceiver outputs your transmitted voice to the headset for monitoring. (p. 18)