Adjusting The Volume; Adjusting Squelch - Simrad RS90 Operating Manual

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Special channel A/B
Certain USA channels have 'A' or 'B' suffixes.
"A" indicates simplex use of the ship station transmit side of an
international duplex channel, and that operations are different than
international operations on that channel. "A" channels are generally
only used in the United States, and use is normally not recognized
or allowed outside the U.S. "B" indicates simplex use of the coast
station transmit side of an international duplex channel. The U.S.
does not currently use "B" channels for simplex communications in
this band.

Adjusting the volume

The volume control on the right hand side of the handset provides
up and down control of the handset speaker volume and the
external speaker volume.

Adjusting squelch

The squelch adjustment allows you to adjust the sensitivity of
the radio so that background noise is minimized. In areas of high
static noise, such as close to large cities, you can improve quality of
reception by adjusting the squelch.
Use the ◄ and ►keys to adjust the level up or down respectively.
•
•
Adjust the level until the background noise just disappears.
¼ Notes:
•
You can also adjust the sensitivity of the VHF receiver using the
Local/Distance setting. See "Radio sensitivity" on page 97.
The ◄ and ►keys are also used for moving the cursor when
•
entering data on a wired handset.
Getting started | RS90 Operating Manual