Raymarine Ray48 manual Glossary of Terms

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	GLOSSARY OF TERMS
VHF	Very High Frequency 30MHz to 300MHz
FM	Frequency Modulation
Carrier Wave	A Radio Frequency on which intelligence is superimposed.
Dual Watch	Monitor channel 16 while working on another channel.
Tri Watch	Monitor channel 16 and weather channel while working on another
	channel.
All Scan	Scans all channels
Memory Scan	Scans only user selected memory channels
US Channels	Channel designations as defined by the FCC
International Channel	Channel designator as defined by International Telecommunication
	Union
Weather Channels	Channels for routine and emergency weather information
	broadcast by NOAA
NOAA	National Oceanographic and Atmospheric Administration
RTCM	Radio Technical Commission for Maritime Services
Simplex	Transmit and receive on the same frequency
Duplex	Transmit and receive on different frequencies
Squelch	A circuit that sets the threshold for cutting off the receiver when
	the signal is too weak for reception of anything but noise.
LCD	Liquid Crystal Display
TX	Transmit
RX	Receiver
RF	Radio Frequency
CPU	Central Processing Unit
PLL	Phase Locked Loop (A type of frequency Synthesizer)
VCO	Voltage Controlled Oscillator
PTT switch	Microphone Push-To-Talk switch

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Contents Ray48 Important Notice PurposeTable of Contents Technical Description Section MaintenanceSection AppendixGlossary of Terms Introduction Equipment FeaturesGeneral Description Planning the Installation InstallationOptional Accessories Unpacking and InspectionTypical Mounting Method Flush Mounting Typical Mounting Methods1104.33 190.74 1515.94 853.03 1606.29 1957.66 1204.72 Electrical Connections DC Power and External Speaker ConnectionsExternal Speaker Connections Power Cable LengthGrounding Antenna ConnectionsAntenna Mounting Suggestions Controls and LCD Display OperationsControls Volume Control On/Off1W Scan WX ALT MON INT MEM LCD DisplayOperating Procedures 16 Plus priority Channel To Select a Weather ChannelChannel Memory Scan ModesMonitor Mode Master ResetWorking Channel Plus priority ChannelTechnical Description PLL Phase Lock Loop CircuitGeneral Control SectionReceiver Circuit Transmitter CircuitReceiver SpecificationsTransmitter Operating Requirement Radio DimensionsRay48 Block Diagram Page Ray48 Assembly Drawing Page How to contact Raymarine MaintenancePage VHF Marine Radio Channels and Frequencies Ray48 Marine Channels Frequency Tables66A International VHF Marine Radio Channels & Frequencies Noaa Weather Radio Frequencies156.525 Digital Selective Calling for Distress and Safety VHF Marine Channel Usage Guide and Licensing Requirements AppendixPage Usage Guide Your ship is sinking, or on fire EmergencyMonitoring Channel 16 & Working Channel Intership SafetyNavigation Coast GuardPort Operations Traffic service onChannels 11, 12, 13 Are used for vesselsMarine Operator CommercialState Control Emergency signalsWeather EnvironmentalAlpha