Furuno FS-1503 - Manual (Page 27)

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9951 Scan/sweep-stop signal level
When the receiver detects a signal whose level is stronger than the preset
level it stops scanning and receives the signal. The setting on system code
9955 is available only when “0” (SQ working condition) is selected here.
Setting range: 0 (Squelch working condition is effective as set on code
9955), 1-10 (S-meter level); Factory setting: 3
9952 Scan/sweep-stop time
When a signal is detected, the receiver stops scanning/sweeping and dwells
on this channel frequency. When “0” (RX) is selected, the receiver keeps
receiving until the traffic goes out of this channel frequency. Define the
dwell time between 1 and 99 sec.
Setting range: 0 (RX), 1-99 sec; Factory setting: 2
9953 Sweep width setting range: 0.01-30000.00 kHz; Factory setting: 100.0
9954 Sweep step frequency
Setting range: 0.01-30000.00 kHz; Factory setting: 1.00
9955 Squelch activation
“Squelch activation” is the method by which the squelch is activated.
Setting range: 0, 1, 2, 3; Factory setting: 3
0: Voice
The squelch is opened by signal frequency less than 1000 Hz (factory set-
ting). This frequency can be changed between 500 – 2000 Hz on system
code 9958. The loudspeaker reproduces a sound when the signal is lower
than the preset frequency.
Squelch OPEN:
Audio signal is detected and a sound is reproduced through the loudspeaker.
Squelch CLOSED:
No input signal but only noise is coming into the receiver. The receiver is
muted.
1: Level
The squelch is activated depending on “signal strength”. The factory setting
is “5”. You can change the level between 0 - 10 on system code 9956.
2: And
The squelch opens when both “voice” and “signal strength” meet the set-
ting.
3: Or
The squelch opens by either “voice” or “signal strength”, whichever meets
the setting.
9956 Squelch level. Setting range: 0-10; Factory setting: 5