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
1. Recall Custom or ITU channel
Custom channels
Custom channels are divided into 20 groups in the scan mode as below.
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| Scan Group | Custom Channel No. |
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| 1 | 1 to 10 |
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| 2 | 11 to 20 |
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| 3 | 21 to 30 |
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| 4 | 31 to 40 |
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| 5 | 41 to 50 |
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| 6 | 51 to 60 |
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| 7 | 61 to 70 |
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| 8 | 71 to 80 |
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| 9 | 81 to 90 |
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| 10 | 91 to 100 |
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| 11 | 101 to 110 |
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| 12 | 111 to 120 |
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| 13 | 121 to 130 |
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| 14 | 131 to 140 |
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| 15 | 141 to 150 |
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| 16 | 151 to 160 |
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| 17 | 161 to 170 |
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| 18 | 171 to 180 |
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| 19 | 181 to 190 |
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| 20 | 191 to 200 |
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