VHF Radio

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Revision as of 21:03, 29 August 2008

Contents

MARINE VHF RADIO

The fairly common Marine VHF Radio - Icom M80 H

Description

Describe VHF radio, it's uses, etc

Procedures

Also see the FCC Website (covers HF Marine Radio as well)

Order of Priority of Communications in Maritime Mobile Service

  • Distress calls, distress messages and distress traffic.
  • Communications preceded by the urgency signal
  • Communications preceded by the safety signal.
  • Communications relating to radio direction finding.
  • Communications relating to the navigation and safe movements of aircraft engaged in search and rescue operations.
  • Communications relating to the navigation, movements and needs of ships and weather observation messages destined for an official meteorological service.
  • Government radiotelegrams relative to the application of the United Nations Charter (ETATPRIORITENATIONS)
  • Government radiotelegrams with priority and government calls for which priority has been expressly requested (ETATPRIORITE)
  • Service communications relating to the working of the telecommunication service or to communications previously exchanged, e.g. service telegrams.
  • Government communications other than those shown ordinary private communications, RCT radiotelegrams (telegrams concerning persons protected in time of war by the Geneva Conventions of 12 August 1949) and press radiotelegrams.
  • The navigation warning should then be re-announced and broadcasted on the working frequency which was announced on the calling frequency.

Navigation warnings broadcasted by shipstations are usually intercepted and relayed by the responsible coast stations but when necessary the shipstations should repeat their navigation warnings at suitable intervals, e.g. when towing another vessel or when the responsible coast station has not acknowledged receipt.

Marine VHF Frequencies & Channels

VHF CHANNELS & FREQUENCIES AND THEIR USE
Note:-The Channel numbers run from 01A >>>>88A (in the Left hand Column). The frequencies In Mega Hertz (MHz) are given for each designated channel, first the transmit MHZ then the Receive MHz. Against each channel is the authorised use for that channel.
Sub-note:- The underlisted are those that are found in most VHF marine radios that are marketed today - 'some earlier models will not have all the US channels and frequencies'.
01A 156.050 156.050 Port Operations and Commercial, VTS. Available only in New Orleans / Lower Mississippi area.
05A 156.250 156.250 Port Operations or VTS in the Houston, New Orleans and Seattle areas.
06 156.300 156.300 Intership Safety
07A 156.350 156.350 Commercial
08 156.400 156.400 Commercial (Intership only)
09 156.450 156.450 Boater Calling. Commercial and Non-Commercial.
10 156.500 156.500 Commercial
11 156.550 156.550 Commercial. VTS in selected areas.
12 156.600 156.600 Port Operations. VTS in selected areas.
13 156.650 156.650 Intership Navigation Safety (Bridge-to-bridge). Ships >20m length maintain a listening watch on this channel in US waters.
14 156.700 156.700 Port Operations. VTS in selected areas.
15 -- 156.750 Environmental (Receive only). Used by Class C EPIRBs.
16 156.800 156.800 International Distress, Safety and Calling. Ships required to carry radio, USCG, and most coast stations maintain a listening watch on this channel.
17 156.850 156.850 State Control
18A 156.900 156.900 Commercial
19A 156.950 156.950 Commercial
20157.000 161.600 Port Operations (duplex)
20A 157.000 157.000 Port Operations
21A 157.050 157.050 U.S. Coast Guard only
22A 157.100 157.100 Coast Guard Liaison and Maritime Safety Information Broadcasts. Broadcasts announced on channel 16.
23A 157.150 157.150 U.S. Coast Guard only
24 157.200 161.800 Public Correspondence (Marine Operator)
25 157.250 161.850 Public Correspondence (Marine Operator)
26 157.300 161.900 Public Correspondence (Marine Operator)
27 157.350 161.950 Public Correspondence (Marine Operator)
28 157.400 162.000 Public Correspondence (Marine Operator)
63A 156.175 156.175 Port Operations and Commercial, VTS. Available only in New Orleans/Lower Mississippi area.
65A156.275156.275 Port Operations
66A156.325 156.325 Port Operations
67 156.375 156.375 Commercial. Used for Bridge-to-bridge communications in lower Mississippi River. Intership only.
68156.425 156.425 Non-Commercial
69156.475 156.475 Non-Commercial
70 156.525 156.525 Digital Selective Calling (voice communications not allowed)
71156.575 156.575 Non-Commercial
72156.625 156.625 Non-Commercial (Intership only)
73156.675 156.675 Port Operations
74156.725 156.725 Port Operations
77 156.875 156.875 Port Operations (Intership only)
78A156.925 156.925 Non-Commercial
79A 156.975 156.975 Commercial. Non-Commercial in Great Lakes only
80A 157.025 157.025 Commercial. Non-Commercial in Great Lakes only
81A 157.075 157.075 U.S. Government only - Environmental protection operations.
82A 157.125 157.125 U.S. Government only
83A 157.175 157.175 U.S. Coast Guard only
84 157.225 161.825 Public Correspondence (Marine Operator)
85 157.275 161.875 Public Correspondence (Marine Operator)
86 157.325 161.925 Public Correspondence (Marine Operator)
AIS 1161.975 161.975 Automatic Identification System (AIS)
AIS 2162.025 162.025 Automatic Identification System (AIS)
88A 157.425 157.425 Commercial, Intership only.
NOAA Weather Radio Frequencies
Channel Frequency (MHz)
WX1 162.550
WX2 162.400
WX3 162.475
WX4 162.425
WX5 162.450
WX6 162.500
WX7 162.525

See the NOAA Weather Radio Homepage for more information.

Additional Information, Frequencies, & Charts

Frequencies are in MHz. Modulation is 16KF3E or 16KG3E.

Note that the letter "A" indicates simplex use of the ship station transmit side of an international duplex channel, and that operations are different than international operations on that channel. Some VHF transceivers are equipped with an "International - U.S." switch for that purpose. "A" channels are generally only used in the United States, and use is normally not recognized or allowed outside the U.S. The letter "B" indicates simplex use of the coast station transmit side of an international duplex channel. The U.S. does not currently use "B" channels for simplex communications in this band.

Boaters should normally use channels listed as Non-Commercial. Channel 16 is used for calling other stations or for distress alerting. Channel 13 should be used to contact a ship when there is danger of collision. All ships of length 20m or greater are required to guard VHF channel 13, in addition to VHF channel 16, when operating within U.S. territorial waters. Users may be fined by the FCC for improper use of these channels. See Marine Radio Watch Requirements for further information.

Emergency channels

Emergency channel numbers

Fault Tracing

  • Ensure that the power supply is switched on.
  • Check that the voltage is correct.
  • Check that the transmitter and receiver are on the correct frequencies.
  • Check that the correct modes have been selected e.g. A3 A3H A3A A3J.
  • Check that the aerial/aerials is/are connected.
  • Check that the aerial/aerials is/are up and are not shorting anywhere.
  • Check all switches and visible connections.
  • Check fuses.
  • If voltage is low check flat batteries and recharge.
  • If voltage is correct but transmitter won't tune up check aerials and fuses.
  • If transmitter tunes up OK and you are unable to establish communication check that you are calling and listening on the correct frequencies. When calling always say where you are listening.
  • Try alternative aerial if available e.g. for portable lifeboat radio. Check that artificial aerial is disconnected.
  • If your transmitter is working satisfactory but you cannot establish communication check that you are within range of the station you are calling.

References

Publications, etc.

Forum Discussions

Links to discussions on the Cruiser Log forum

External links

Links to relative websites.


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