NASA SX 35 DSC - Manual (Page 17)

SX 35 DSC 15
To properly set the VOL and SQ controls:
• Rotate the SQ control fully CCW.
• Rotate the VOL control CW until background noise is plainly heard.
• Slowly rotate the SQ control CW until the noise is muted (squelched).
Then adjust the control slightly more CW (approximately 1/8 turn). Use
care not to set the
SQ control more CW than necessary or weak signals
may not be heard.
Some channels exhibit more background noise than others, so it may be
necessary to readjust the squelch setting when changing channels or when
scanning.
Channel Selection
When the transceiver is turned On, the Primary Calling Channel (channel
16) is selected.
There are three ways to change channels:
• Rotate the SELECT knob, press and hold the
ENT
or
EXIT
keys, or di-
rectly enter the channel number using the numeric keys on the micro-
phone. The
ENT
and
EXIT
keys will always change channels except when
being used to enter or edit a directory page.
Channel Banks
Your SX 35 DSC is designed for use with the International VHF marine
channel frequencies plus authorized local channel frequencies. Only au-
thorized dealers can program other approved country channels, where spe-
cifically allowed by government regulations, by using the 8 pin com con-
nector.
Keypad, Transceiver
A tone is emitted each time a key is pressed. A three beep error tone is
emitted when a key is not allowed. Some functions require a key to be
pressed and held. After the hold period times out, a second tone is emitted
as the function is entered. The basic purpose for each key follows. Detailed
usage of keys is described in operating procedures for the transceivers vari-
ous functions.