Simrad PI GEOMETRY - QUICK REFERENCE GUIDE REV B Manuel d'installation Page 152

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SimradSH90
Table1CWandFMpulselengths(inmilliseconds)fordifferentranges
Range
CWShortCW
Normal
CWLongFMAutoFMShort
FM
Normal
FMLong
500,20,41,23333
75
0,20,41,23333
1000,40,82,46366
1500,61,23,6123612
2000,81,64,8123612
3001,22,47,220
5
1020
4001,63,29,62461224
5002,04123281632
6002,44,814,440102040
750361848122448
1000482460153060
12004,89,628,860153060
15006123660153060
20008164860153060
AboutCW(ContinuousWave)
Thefrequencyofthetransmitterpulseishereconstant,andequal
totheoperationalfrequency.
Youcanselectbetweenthreedifferentpulselengths;Short,
NormalandLong.Inaddition,thepulselengthwillalsochange
automaticallyinaccordancewiththeselectedrange.Thetable
aboveshowsthedifferentpulselengthsgiveninmilliseconds
(ms).
AboutFM(FrequencyModulation)
IntheFMmode,thetransmitterpulseisfrequencymodulated.
Thismeansthatthefrequencyofthetransmittedpulsechanges
duringthetransmission.Thereceiverundertakesaspectrum
analysistocomparethereceivedechoeswiththetransmitters
frequencycode.Thisprovidesastableechopresentation,and
greaterabilityofdetectionasnoiseandreverberationarereduced.
Relatedtopics
Horizontalmenuonpage93
Verticalmenuonpage95
Vertical180menuonpage96
150
323775/B
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