Consilium SELUX ST, Installation And Service Manual

Page: 87 / 180

RADAR CONFIGURATION
3.14 Rev. E
3.8.2
Transceiver Communication Type
Pressing the
B
button of fig.
3.7.1
is possible to adjust amplitude and slope of the TXRX
Pre-STC. The range scale is automatically set to 0.75 NM. Amplitude and slope can be
adjusted using the up and down arrow. This adjustment optimises the minimum visible
distance and it can affect the auto-tuning performance for TXRX not derived from SRT.
Connecting the probe of the oscilloscope to the pin STC of TB13 of the RTM Control B
PCB (the connector of the I.F. Amplifier, normally the blue wire), the PRESTC ramp will
be display on the scope.
The Amplitude shall be adjusted to be about 4 - 4.2V.
The Slope shall be adjusted to be about 2 - 3 µs.
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 the
main bang and the too close echoes that otherwise would be in saturation. This
adjustment is normally perfectly performed at the testing in the factory, and shall be
not be touched again, and only very skilled and expert with radar people shall touch
this adjustments in case of very special situations.
The digital potentiometer values to measure the above described Amplitude and
Slope values normally are:
Amplitude 58 - 60
Slope 5 – 9
CAUTION
BAD ADJUSTMENT OF PRESTC WILL COMPROMISE ARPA GOOD WORKING
AND / OR AUTO TUNING FACILITY.