User's Manual Part 2

Operator Manual
2−136
3748DOC020102 Edition: 14.JAN.2005
Monitoring efficiency of radar reception system
Adjust the radar GAIN to obtain a floor noise that is just visible. If the radar is
working correctly, the 4 arcs must be recognizable; in particular the furthest
must be hardly recognizable by floor noise.
The 4 markers are visualized with decreasing intensity starting from the nearest
marker to the one furthest from the center of the radar video.
Each jump in intensity indicates a decrement of 3 dB in reception.
If the sensitivity of the receiver decreases by 10 dB, the marker nearest to the
center of the radar video will only just be recognizable above the noise.
In the extreme condition corresponding to a degradation in power equal to or
greater than 10 dB for the transmitter and receiver, only one marker will appear
on the radar video at a distance of 4 NM.
Figure: 2−78 PMU receiver and transmitter check
Info
The dotted lines are only
used to explain the
PMU check.
PMU
receiver/transmitter check
Degradation of 10 dB for
receiver
Degradation of 10 dB in
transmitter and receiver
power