Simrad argus - Performance Monitor Adjustment

Argus Radar - RADAR CONFIGURATION
988-10187-004 3.14
The PRESTC is not a video processing to be used continuously during the normal
operating, but it is a fixed STC curve stored in the TXRX to suppress enough main
bang and too close echoes that otherwise would be in saturation. This adjustment
is normally perfectly performed at the testing in the factory, and shall not be
touched again, and only very skilled radar experts shall be allowed to touch these
adjustments in case of very special situations.
The digital potentiometer values to measure the above described Amplitude and
Slope values are normally:
- Amplitude 58 - 60
- Slope 5 – 9
CAUTION
BAD ADJUSTMENT OF PRESTC WILL COMPROMISE ARPA GOOD WORKING
AND / OR AUTO TUNING FACILITY.
3.8.3 Performance Monitor Adjustment
Press the C button of fig. 3.8.1, page 3.12, to control the performance monitor. The range
scale is automatically set to 24 NM and the performance monitor activated. Set the
transceiver at maximum tuning using the Auto Tuning function or by adjusting the Manual
Tune Progress bar to have the best echoes performance on the screen.
The top arrow buttons can be used to adjust the opening of the Performance Monitor Ring
(now visible on the screen) and the bottom ones can be used to adjust the distance of the
above mentioned ring.
Referring to the above figure "OPEN" and "DISTANCE" labels indicate the actual values
of the digital potentiometers.
The Opening shall be adjusted to around 60 to 100 degrees.
The Distance (which correspond to the Power Level) shall be adjusted to a value of
around 180 in the label down on the left (P.L.).
NOTE
the performance monitor is a facility used to check the performance of the
transceiver, so it is very important that it is made one time at the
installation. If, for example, the Power Level is low and the distance is less
than 24 NM, it could indicate that the Performance Monitor is not correctly
adjusted, but the reason could also be that the performance of the TXRX
is low and the magnetron could be old or defective.