Furuno FS-1562-15 - Manual (Page 23)

-1.15-
Squelch control:
Squelch is used to mute the receiver audio output when the receiver input is less than a preset value
or dominant noise is higher than a preset (1000 Hz) level. To switch the squelch function ON,
press the [5] SQUELCH key. Make sure the label “SQ” appears on the display. To pick up a weak
signal at high audio frequencies, you should remove the squelch function notwithstanding a
possible increase of background noise. To do this, press the [5] SQ switch again. Make sure the
label “SQ” goes off.
Noise blanker (NB):
Always in circuit. This function is to clip off inputs noise resulting from an engine ignition or
motor brush sparks.
1.11 Frequency Scan
Channel scan:
Scan is the function where the receiver watches 10/group custom or ITU channels in succession
at predetermined intervals. The scan-stop signal level and scan-stop time can be changed on
system codes 9951 and 9952, respectively. Prior to the use of the scan function, turn AGC on.
1. Recall Custom or ITU channel
Custom channels
Custom channels are divided into 20 groups in the scan mode as below.
Scan Group Custom Channel No.
1 1 to 10
2 11 to 20
3 21 to 30
4 31 to 40
5 41 to 50
6 51 to 60
7 61 to 70
8 71 to 80
9 81 to 90
10 91 to 100
11 101 to 110
12 111 to 120
13 121 to 130
14 131 to 140
15 141 to 150
16 151 to 160
17 161 to 170
18 171 to 180
19 181 to 190
20 191 to 200