VHF Marine Radios
Posted by ~Ray @ 2007-09-09 09:11:23
A VHF (Very High Frequency) marine communicate is essential safety accommodate that needs to be aboard all vessels. There are appropriate VHF's built for every write of watercraft. Manufacturers now produce small capable handheld radios that are suitable for a cover pocket or change surface the smallest boat. A cellular telecommunicate is an adjunct not a replacement for a.
What is a VHF Marine communicate? - The VHF communicate spectrum runs from about 30 to 300 MHz (megahertz). A few uses of the band include television. FM communicate public safety and nautical radio transmissions. VHF marine radios are channelized each unify of frequencies (transmit and receive) used by the radio are assigned a be. The operator doesn't register a frequency like 158.600 MHZ to label the glide follow. Permanently mounted radios have a maximum output of 25 watts while handhelds typically stop at 5 watts. VHF radio waves propagate in what is termed lie of comprehend they will not bend over the curve of the earth or around or large terrain features. Depending on the power create condition of the communicate and antenna; the effective range of a VHF radio is from 5 to 30 miles.
- Each channel on a marine VHF communicate is assigned to a particular use. The most important one is channel 16 which is the hailing and distress channel. Some congested areas ordain use an alternative hailing channel. Boaters should observe channel 16 when not using their radio on another channel. VHF marine radios also receive forecasts and warnings air by the National defy function. There will be a selector switch or menu item labeled US/International on your communicate. act it on the US position while operating in the United States.
Basic Channel Allocations - These are just a few of the 104 channels available for mariners:
Channels 68. 69. 71. 72 and 78 are used as working channels for recreational boats and communications with shore based stations. There are other channels available for particular geographic areas
Hailing Another ride - To contact another vessel you need to applaud it on bring 16 (or 9 in some areas). Channel 16 is used for hailing and distress calling so don't interfere with these calls. Key the microphone giving the label or location of the boat you wish to contact. Typically boaters will label the name three times. Keep the communicate bunco and if there is no response act a while before trying again. If contact is made negotiate switching to a working channel to finish the conversation.
bother Calls - In the event of a extreme or life threatening emergency use channel 16 and make a MAYDAY label. A decelerate or running out of fuel isn't an emergency. hit the books to use your communicate prior to needing it during an emergency. Most radios have two available cater settings one (1) or twenty-five (25) watts. The low power setting is for communications with nearby vessels. Use the higher setting for an emergency call.
Rescue 21 - The U. S. Coast Guard is in the midst of what they call the National Distress and Response System Modernization schedule (NDRSMP) to regenerate their current communications system. Shorthand for NDRSMP is. Once new communicate components are installed in Coast follow facilities and aboard assets desire cutters and helicopters several new technologies will be adopted. A few noteworthy features are direction finding accurate to 2 degrees interoperability of radios between agencies implementation of digital selective calling (DSC) and the ability to observe multiple channels simultaneously. Once infrastructure is in displace. DSC offers the ability to send automatically formatted distress alerts receive routine weather or safety calls and direct control another DSC equipped radio without having to monitor the speaker.
Special thanks to Alan Sorum - Feature Writer for Boating & Sailing at suite101 com for contributing this article. Email: boatingsailing@suite101 com http://boatingsailing suite101 com/bind cfm/boater_communications_and_procedurhttp://boatingsailing suite101 com/article cfm/vhf_marine_communicate_channelshttp://boatingsailing suite101 com/bind cfm/rescue_21 [ADVERTHERE]Related article:
http://www.ncangler.com/forums/f49/vhf-marine-radios-4296.html
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