Sq Freq]; Default: 1000 - Furuno FS-1575 Service Manual

4.3 SYSTEM

4.3.1 [1. SQ FREQ]

Default: 1000

The [3]: SQ key is used to turn ON or OFF the SQ circuit. The default is 1000 Hz.
The SQ circuit is enabled in SSB and LSB modes. Changing to any other mode
automatically turns OFF the circuit, while returning it to SSB or LSB mode turns ON
the circuit.
This function is incorporated in FS-2575C and can be set by each unit of FS-2575C.
For example, when two units of FS-2575C are installed, No. 1 unit allows for setting
SQ FREQ to 1000 Hz with the SQ function turned ON, while No. 2 unit allows for
setting SQ FREQ to 800 Hz with the SQ function turned OFF.
The SQ circuit detects the spectrum of audio signal. When the SQ circuit detects a
frequency component lower than a set frequency, it will turn ON the AF output.
Approximately 70-msec delay time is provided to open the SQ circuit, and
approximately 1.5-s delay time is provided to close it.
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