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RHOTHETA User Manual RT-800
Page 155 of 192
Fig. 167 Squelch dialog
o
Pushing the arrow keys allows switching between the frequencies (green frame
indicates the currently chosen frequency).
With the arrow keys
the squelch can be adjusted manually to the desired
level in one-percent-steps.
It is also possible to set the squelch level for the main frequency automatically,
according to the received signal level. To use this function, push the hotkey “Autoset
SQL” (s. field “A”). The squelch can also be turned to the zero level, e.g. for the
purpose of receiving very weak signals, which are “hidden” in the noise. The turning off
of the squelch is accomplished by pressing the “Off”-hotkey (s. field “B”).
To apply the function of the automatic squelch adjusting to all the stored frequencies
press the hotkey “Autoset All” (s. field “C”).
Note
While operating on the noise edge or inside the noise (e.g., in order to find weak
signals), the warnings “22” or “23” (s. 13.2) can occur, if the received signal has a
positive or negative offset of the currently set bearing frequency. This might be caused
by the irregular noise power spectrum distribution.
6.5.4 Dimming and Day/Night Mode
The brightness of the display and key illumination can be adapted to surrounding lighting
conditions.
The button
(twin function key, s. Fig. 2, position 5) has two keys (“-“, “+”) to adjust
the brightness of:
- “Display”: backlight of the display
- “Keys”: colored illumination of the three buttons:
, which is
turned on, when the corresponding function is active.
- “Legends”: backlight of the keypad legends