RT-500-M
RHOTHETA
Page 51 of 168
User Manual
If a signal is found and the direction finder should bear this signal 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. 7.2.3.3).
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 read also chapter 7.5.3)
7.2.3.2 „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. 7.4.3.5).
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.
7.2.3.3 Fast Channel Scan Settings
o
To start the “Fast Channel Scan” mode select the corresponding line on the “Scan” page and
press “OK” or the hotkey “Start Scan” (s. Figure 41, position 1)
Figure 41. Activating the “Fast Channel Scan”
o
Pressing the hotkey “Stop Scan” (s. Figure 41, position 2) will terminate the scan mode and
change to the bearing of the frequency, that was set before the scan mode has been activated.
o
You can also stop the scan mode by pressing the “HOME” button on the “Bearing” page with
activated scan. After you have confirmed the special dialog (s .Figure 42), this mode will be
terminated.
