Radio Shack 20-163 User's Guide download pdf (Page 13)

To set the keytone:

1. Turn on the scanner. “Multi-system Trunking Scanner” appears.

2. While “Multi-system Trunking Scanner” appears, press 1 to turn

on the keytone or 2 to turn it off.

To change the backlight mode:

Repeatedly press DIM to adjust display backlight brightness from

Dark, Light off, or Light.

Delay

Sometimes, several seconds can pass between transmissions. To

avoid missing a reply, a delay is automatically set for each channel.

The scanner stops for 2 seconds after a transmission stops before it

resumes scanning or searching.

To turn the delay on / off:

1. Press ./DELAY. DLY appears if the delay is on.

2. To turn on the delay, press ./DELAY again. “dly” appears if the

delay is off.

Squelch and Attenuator

The squelch and attenuator control the scanner sensitivity. If you hear

a hissing sound, the scanner will remain on the current channel.

To set squelch:

1. Turn off the scanner and turn SQUELCH fully counterclockwise.

2. Turn on the scanner. You should hear a hissing sound. If you set

the squelch precisely at the threshold where the hiss stops, the

scanner may pick up unwanted or very weak transmissions. To

prevent this, set the squelch past this threshold.

3. Turn the SQUELCH clockwise to decrease the scanner’s

sensitivity, turn counterclockwise to increase its sensitivity.

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Radio Shack 20-163 User's Guide Page 13