Rhotheta RT-500-M, Руководство пользователя

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RT-500-M
RHOTHETA Page 142 of 168 User Manual
7.5.3 Adjusting of the Squelch
The correct adjustment of the squelch is crucial for attaining the optimal sensitivity of the signal
reception. The more sensitively the system works, the greater signal range (operating distance) can
be achieved. Especially weak signals are often located on the edge to the noise level or even inside
the noise level.
Therefore, it is very important to continuously check the squelch level setting and adjust it to the given
signal strength and environmental situation in order to use the direction finder system to the full
capacity of performance.
o
Pushing the button “+” or “-” (twin function key, s. Figure 8, position 6): opens the
following dialog:
Figure 184. 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.