RHOTHETA User Manual RT-800
Page 50 of 192
frequency, that receives a valid signal at the moment of pressing the “OK” button, will
be adopted as the main frequency, and the system will change to a normal bearing
mode.
“Monitoring” On
Active frequency:
Main frequency = COSPAS-
SARSAT frequency, which is not
known yet.
The system performs the
COSPAS-SARSAT scan in order to
determine the COSPAS-SARSAT
sender frequency.
Signal is not present.
“Monitoring” On
Active frequency:
Monitoring frequency = 243.000 MHz
Signal is not present.
The system recognized a sender on
the 406.041 MHz frequency, which is
shown in place of the main bearing
frequency.
Fig. 26 “Monitoring CP-SS” mode. Example views of the “Bearing” page
In the case of COSPAS-SARSAT frequency as the main bearing frequency, the Monitoring
CP-SS function is activated automatically, when the “Monitoring” scan is selected.
This operation mode differs from the normal monitoring mode with a non-CP-SS-frequency as
the main bearing frequency (s. 6.2.2.2).
The “CP-SS” monitoring procedure will first look for the COSPAS-SARSAT signal and then, if
no pulse has been detected for 60 seconds, it will search for other monitoring frequencies one
after another (not alternating with the main frequency as it is in the standard case).
If a COSPAS-SARSAT signal is detected, the system releases an alarm and decode the
pulse, which can then be seen on the “Decode” page.
Note
If a valid COSPAS-SARSAT signal is detected during the 60-seconds-period of the monitoring
procedure, the correct COSPAS-SARSAT frequency channel of the sender is determined in
the first cycle (first 60 seconds period of the CP-SS scan).
Only at the second cycle of this scan algorithm the bearing and decoding information of a
COSPAS-SARSAT signal is stored and shown on the corresponding pages.
6.2.2.1 Timing of Normal Monitoring Operation
The main frequency (here channel 16, s. Fig. 27) is monitored with the highest priority. The
duration of the monitoring cycles may be extended if signals are received on the monitoring
frequencies.