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RHOTHETA User Manual RT-800
Page 64 of 192
For the case that the exact COSPAS-SARSAT frequency of the emergency beacon is
not known, there is a possibility to set “All CP-SS” in place of the main frequency,
which will then trigger the COSPAS-SARSAT scan as the first step of this scan
algorithm. After the first COSPAS-SARSAT impulse is detected, the exact COSPAS-
SARSAT frequency will be identified automatically and used for the further bearing in
this scan mode.
o
Two next frequencies of this algorithm are always set by default and are not
changeable:
1) 121.500 MHz
2) 243.000 MHz
o
The two remaining scan frequencies are freely selectable.
Designation of the currently active scan
mode
Main bearing frequency (currently active)
Scan frequencies
(here only one of the freely selectable
frequencies is set)
Fig. 44 SAR scan. Indication of frequencies
If the SAR scan function is activated, the DF system switches alternating from searching of
the COSPAS-SARSAT pulse (main bearing frequency) to scanning of the other emergency
frequencies using the breaks between the pulses (s. 6.2.5.1).
The currently monitored frequency is displayed highlighted in green, so you can see which
frequency is active at a given moment (s. Fig. 44).
If a signal is received during the scan procedure, the bearing value is indicated on the
“Bearing” page.
o
In order to interrupt the current reception, press the “ESC” button. The system will
continue with the next scan frequency.