Chinese Chinese Français Français Deutsch Deutsch English English Español Español Português Português Russian Russian اللغة العربية اللغة العربية

Register | Login | Help | Feedback | SiteMap | Add to favorites | Currency:

Home Shopping Categories Brands About US Shipping Payment News & Events
2024-12-22 Search Advanced Search
0 Items ($ 0.00) Checkout Account

Hidden

Hidden

My account

Register / Login
Shopping Cart(0)
Compare Now(0)

Your Recent History
BAOFENG

HM-180 Speaker Microphone , HM-180 Mic Replace EM-48/HS-50/EM101 For ICOM IC-M700 IC-M710 IC-M700PRO IC-M60e
$15.00

6 Colors Walkie Talkies Repair Replacement Front Housing Case Kit for Motorola GP328 GP340 HT750 Radio with Speaker--VBLL
$15.00

PMLN5192 WPLN4137 WPIN4139 Battery Charger for MOTOROLA Radios CP200 EP450 CP040 CP140 CP180 DP1400 GP3688 PR400 DEP450 CP150
$6.99

Máy bộ đàm YAESU FT-250R
$135.00

YAESU FT-250R VHF 136-174Mhz Handheld radio
$135.00

More>>

  Home >> Baofeng Brand >> BAOFENG >> Marine VHF & WX Frequencies Baofeng UV-3R Dual Band Micro just what's All the Fuss About?Well to star,the price USD32

Marine VHF & WX Frequencies Baofeng UV-3R Dual Band Micro just what's All the Fuss About?Well to star,the price USD32 [Comments(0)|Leave your Comment]
Brand:BAOFENG
Item#:12061601090594
Score:0  (Score change Discount Voucher)
Weight:0.6 kg.
List Price:$25.00
Price:$15.00
You Save:$10.00
Qty:

Prev:BAOFENG UV-8 Professional Walkie Talkie 128CH Two Way Radio with DTMF/ANI Code/Call Tone 1750Hz/Flashlight/FM Radio

detail

Related

Comment

Payment

Shipping

Marine VHF & WX Frequencies


 

Marine VHF & WX Frequencies

Marine VHF radio is installed on all large ships and most seagoing small craft. It is used for a wide variety of purposes, including summoning rescue services and communicating with harbourslocksbridges and marinas, and operates in the VHF frequency range, between 156 to 174 MHz. Although it is widely used for collision avoidance, its use for this purpose is contentious and is strongly discouraged by some countries, including the UK.[1]

A marine VHF set is a combined transmitter and receiver and only operates on standard, international frequencies known as channels.Channel 16 (156.8 MHz) is the international calling and distress channel. Channel 9 can also be used in some places as a secondary call and distress channel. Transmission power ranges between 1 and 25 watts, giving a maximum range of up to about 60 nautical miles(111 km) between aerials mounted on tall ships and hills, and 5 nautical miles (9 km) between aerials mounted on small boats at sea-level.[1]Frequency modulation is used, with vertical polarization, meaning that antennas have to be vertical in order to have good reception.

Modern day marine VHF radios not only offer basic transmit and receive capabilities, many package additional features that truly make these radios indispensable for the mariner. For the last several years all fixed mount marine VHF radios have required by certification some level of "Digital Selective Calling" (DSC) calling capability. Even the basic set has the ability to alert other boats, ships, and shore stations with a single button press. More expensive radios offer far more extensive DSC capabilities. These may include position polling or a variety of group calling options. Most mid-priced marine VHF radios integrate other features too. Many have the ability to connect to a remote microphone and act as an intership intercom system. Still others have a built-in hailer that when connected to an external hailer horn can act as a public address system and/or output required fog signals when conditions warrant. The most sophisticated marine VHF radios have an alphanumeric keypad for data entry, are able to connect to optional voice scramblers, and a few even have the ability to use a Bluetooth headset. The newest combination of features offered is the integration of a complete Class B AIS unit with a marine VHF radio.

Marine VHF mostly uses "half-duplex" transmission, where communication can only take place in one direction at a time. A transmit button on the set or microphone determines whether it is operating as a transmitter or a receiver. The majority of channels, however, are set aside for "duplex" transmissions channels where communication can take place in both directions simultaneously.[1] Each duplex channel has two frequency assignments. This is mainly because, in the days before mobile phones and satcomms became widespread, the duplex channels could be used to place calls on the public telephone system for a fee via a marine operator. This facility is still available in some areas, though its use has largely died out. In US waters, Marine VHF radios can also receive weather radio broadcasts, where they are available, on special receive-only channels wx1, wx2, etc. or a normal channel reserved for broadcast in the area in question.


Most, if not all, the radios sold by Fleetwood Digital Products, are compatible with these frequencies.

*** For further information regarding the use of the marine frequencies ***
About US
About US
Contact US
Payment
Bank Transfer
Online Payment
Bank transceiver paypal payment
Shipping
Express Delivery
EMS
Post Office
Service
Return Policy Information
Service
User Guide
User Guide
About Score
About user types
Return Policeies
Return Policies

Links:
Copyright 2024 honkangsolar.com. All Rights Reserved.  Phone Number:+86-595-22392886  Fax+86-595-22392886
Email:amateuradio@163.com copyright 2021 honkangsolar.com Administrator Login