Raymarine RAY91 - Obtaining MMSI Number

4.2CheckingforRFinterference
Ifyoususpectadevicemaybecausingradiofrequency(RF)interferenceyoucanuseyourVHF
radiotocheck.
1.T
urnoffthesuspectdevice.
2.TuneyourVHFradiotoaquietchannelsuchasChannel13.
3.Adjustyourradio’sSquelchcontroluntiltheradiooutputsaudionoise.
4.Re-adjustyourradio’sSquelchcontroluntiltheaudioisquiet,onlyslightlyabovethenoise
threshold.
5.Turnonthesuspectdevice.
•Iftheradio’saudionoiseincreasesthenthedeviceiscausingRFinterference.
•Ifthereisnochangeintheradio’saudionoisethenthedeviceisnotcausingRFinterference.
Note:IfRFinterferenceispresentthenitislik elythatbothVHFandAISreceptionarebeing
degradedbythedevice.
Multipleantennainstallations
Importantadditionalconsiderationswheninstallingmultipleantennas.
T opreventpotentialchannelinterferencewheninstallingtwoormoreVHFradiosonthesame
vessel,ensurethattheantennasarelocatedatleast2.4m(8ft.)awayfromeachother.
A udioTroubleshooting(transmission/reception)
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