User's Manual

Table Of Contents
NACOS Platinum
ED 3100 G 110 / 02 (2011-10)
Operating Instructions
A-5 RADAR Sidebar - Permanent Area
A RADAR.fm / 10.11.11
A-40
5.1.3 Pulse Length
Long Pulse is available for any range of the radar. The internal pulse length changes with respect to
the selected range automatically. For detailed information on the pulse lengths for any range, please
refer to page A-23.
The default setting for the pulse length should be short pulse, which means no checkmark on
Long Pulse.
The short pulse delivers a better resolution, targets which are very close together will be displayed as
separated echoes.
A longer pulse has a higher energy, but not a higher amplitude. Thus, it delivers stronger echoes and
possibly a better target visibility at longer ranges. But it may be possible that two targets which are very
close together would be displayed as one echo.
In general, it is advisable not to use the long pulse in rainy conditions.
It is allowed to switch between the two pulse lengths at any time.
If target enhancement or any other filtering methods are active, the stronger echoes are processed by
the filters and are able to improve a weak radar picture.
5.1.4 Adjusting the Transceiver
The selected transceiver´s tuning and Interference Rejection can
only be adjusted by the MFD which is selected as Master for it.
If Master is not selected, the Adjust control will be insensitive.
Tuning
The tuning (adjustment of the transceiver frequency) can
be influenced manually or by means of the automatic
control.
An optimum tuning is not only important for a clear
visual display of the targets on the video but is also a
necessary prerequisite for the ARPA functions.
Automatic tuning
The default setting is Auto Tune, the transceiver frequency is controlled automatically.
The slider is moved automatically by the system into the position of the optimal value.
If two X-Band or two S-Band systems are being operated simultaneously, disturbance of automatic tuning
might occur (if it is being used). In such cases, manual tuning is appropriate.
Manual tuning
Clear the Auto Tune checkbox and use the slider to perform manual tuning. The green indicator bar
above the slider corresponds to the amplitude with which the input signal is available for signal
processing. Observe more than one antenna rotation to find the maximum.
Interference Rejection