User manual: Installation and Operation of Direction Finder System RHOTHETA RT-600 / SAR-DF 517
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Examples of different squelch settings:
Without received signal, the noise level (a) is below the correctly
chosen squelch level (b). The receiver audio output remains quiet,
and no bearing is indicated.
With the same received noise level (a), but wrongly set squelch
level (b), there will be an erroneous, noisy bearing available if
there is no receive signal available at that time.
If the squelch is operating in automatic squelch mode, this is
indicated by a sign “A” (c) above the squelch level marker.
Depending on the SN-Ratio Setup, the squelch level is set slightly
higher than the noise level. Using the SQL rotary switch (1), the
user would be able to force the squelch level to a manual setting.
Automatic setting can be re-entered by setting the manual setting
to < 0 % or > 60 %.
Strong, short receive signals will not modify the squelch level
setting.
Five Examples for Squelch operation
If the squelch functionality is controlled by the system, without user
interactions being allowed, this is indicated by a “X” sign (c) above
the squelch level marker.
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