User's Manual

Lowrance LHR-20/22 Operation Instructions10

2. Adjusting Squelch

Squelch is used to eliminate static and background noise between transmissions, and allows silent

operation of the radio until a transmission is received. If Squelch is set too high, only the strongest

transmissions can be heard, and if it is set too low, intermittent static and noise may be heard.

Squelch is controlled by

SQL knob located on the top of the radio.

To set Squelch:

1. Turn SQL knob fully counter-clockwise. You will hear a lot of static noise.

2. Then turn SQL knob clockwise slowely until the static noise stops, this is the correct position

for the SQL knob.

3. Transmitting and Receiving

Use PTT (Push-To-Talk) key to transmit (speak) on the selected channel.

To transmit and receive:

1. Press and hold PTT key, then speak about 3 to 4” away from the microphone. The “TX” icon

will appear on the LCD display while you are transmitting.

2. Release

PTT key when finished speaking. The radio will change to listening mode.

3. For receiving, the PWR/VOL (volume) knob can be adjusted for the best listening audio

output from the speaker.

NOTE: Before transmitting, make sure the selected channel is not busy and is not designated

“receive only” (“B” icon showing) such as CH15. See the marine Channel charts for traffic type

information at the back of this manual.

4. Accessing the 16/9 Priority Channels

The Channel 16/9 Priority key allows you to access the emergency Coastguard channel 16 quickly;

pressing and holding this key also allows you to quickly access channel 9, which is an alternate

emergency channel in some areas.

To access the 16/9 channels:

1. Press Channel 16/9 Priority key to access channel 16.

2. To access the alternate channel 9 which is available in some areas, press and hold the Channel

16/9 priority key for 3 seconds, then release.

5. Selecting Channels

Use or (UP/DOWN) key to scroll through the available channels.

For a list of channels and their frequencies, see marine Channel charts at the back of this manual.

CAUTION

DANGER

WARNING

The user is advised to adjust the Squelch level depending on your movement and/or location.

Setting Squelch too high can cause weak signals (including weak distress calls) to be missed.