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RHOTHETA User Manual RT-800
Page 56 of 192
“Fast channel scan” = On
Active frequency = 243.300 MHz
Signal is not present.
“Fast channel scan” = On
Active frequency = 121.500 MHz
Signal is present.
Fig. 34 Fast channel scan indication on the "Bearing" page
In case that an unwanted signal is found, the scanning process can be proceeded
immediately by pressing the “ESC” button.
If a signal is found and should be beared permanently, the scanning process can be ceased
either by pressing the button “OK” (the current frequency will become the new bearing
frequency on the “Bearing” page), or by pressing “HOME” (in the scan dialog “Stop Scan”)
and then using the “Go to result” hotkey (s. 6.2.3.3).
Note
If there are interferences on the frequency band which are above the squelch level, scanning
stops as well at these interferences (they are interpreted as signals). This may be avoided by
adjusting the squelch level manually adjusting the SNR value.
Because of this, it may be possible that weak signals are not received anymore (for correct
squelch adjustment see also chapter 6.5.3).
6.2.3.2 „Alarm Only Decoding“ / „Beep Tone“
If the mode “fast channel scan” is activated, a “Beep Tone” filter can be activated for each
frequency additionally.
The alarm is only activated for signals with a distinct (preconfigured) audio frequency and
activates an alarm immediately if such a signal was recognized.
The parameters of the audio signal (upper and lower audio frequency and the minimum
required duration of the signal) can be configured on the “Setup” page (s. 6.4.3.6).
Note
This function can be used to search e.g. NOVATECH radio beacons which transmit a two-
second signal with an 800Hz audio tone every six seconds.