Furuno FAR-1416, Operator'S Manual

Page: 41 / 226

1. OPERATIONAL OVERVIEW
1-27
Accordingly, the short pulse may be preferable in rain on ranges less than 10 NM.
1.21 Interference Rejector
Mutual radar interference can occur in the vicinity of an-
other shipborne radar operating in the same frequency
band. It is seen on the screen as a number of bright
spikes either in irregular patterns or in the form of usually
curved spoke-like dotted lines extending from the center
to the edge of the picture. Activating the interference re-
jector circuit can reduce this type of interference. The in-
terference rejector is a kind of signal correlation circuit. It
compares the received signals over successive trans-
missions and reduces randomly occurring signals. There
are three levels of interference rejection depending on
the number of transmissions that are correlated.
1. Open the [MAIN MENU].
2. Select [ECHO], then press the
left button .
3. Select [CUSTOMIZE ECHO], then press the left
button .
4. Select [INT REJECT], then press the left button .
5. Select the rejection level from [1], [2], [3] or [OFF],
then press the left button .
Level [3] provides the highest level of rejection.
6. Close the menu.
16
12
10
8
6
4
2
0
14
0 2 4 6 8 10 12 14 16
4 mm/h rain (short pulse)
16 mm/h rain (short pulse)
4 mm/h rain (long pulse)
16 mm/h rain (long pulse)
Original range of first detection (NM)
16 mm/h rain - short pulse
4 mm/h rain - short pulse
16 mm/h rain - long pulse
4 mm/h rain - long pulse
Reduction of rain to first detection due to rain at X-band
The author thanks the International Electrotechnical Commission (IEC) for permission to reproduce Information from its Interantional
Standard IEC 62388 ed.1.0 (2007). All such extracts are copyright of IEC, Geneva, Switzerland. All rights reserved. Further
information on the IEC is available from www.iec.ch. IEC has no responsibility for the placement and context in which the extracts
and contents are reproduced by the author, or is IC in any way responsible for the other content or accuracy therein.
Reduction of Range of First Detection (NM)
[CUSTOM ECHO MENU 1/2]
1. BACK
2. INT
REJECT
OFF/1/2/3
3. ECHO
STRETCH
OFF/1/2/3
4. ECHO
AVERAGE
OFF/1/2/3
5. ACE
OFF/ON
6. TARGET
ANALYZER
OFF/ON
7. HATCHING
OFF/ON
8. NOISE
REJECT
OFF/ON
9. [PULSE]