What is VHF and MF?
Digital selective calling or DSC is a standard for transmitting pre-defined digital messages via the medium-frequency (MF), high-frequency (HF) and very-high-frequency (VHF) maritime radio systems. It is a core part of the Global Maritime Distress Safety System (GMDSS).
What are the main purpose of MF HF DSC?
The MF/HF has Digital Selective Calling (DSC*) as standard with a built in Class A 6CH DSC watch-keeping receiver. You can transmit and receive digital selective calls for quick and efficient establishment of distress, urgency, safety and routine communication with other ships and coast stations.
What is MF and HF radio?
MF/HF radio station is a high tech equipment, designed for receiving and transmitting messages between vessels in the medium and high frequency range. It usually consists of a transceiver, a control block, and an antenna.
How do you test MF and HF?
Printer test checks the connection between MF/HF equipment and printer. Go to Menu#2 -> READOUT & SET UP -> press 4 -> press ENT. This displays the “SELF TEST” screen. Select the “printer test” and press ENT.
What is the MF DSC frequency?
2 187.5 kHz
The announcement is carried out by transmission of a DSC safety call on the DSC distress calling channel (2 187.5 kHz on MF, channel 70 on VHF). The safety message is normally transmitted on the distress and safety traffic channel in the same band in which the DSC call was sent, i.e. 2 182 kHz on MF, channel 16 on VHF.
What is MF in ship?
MF Ship Prefix Abbreviation. 1. MF. Motor Ferry. Ship Name, Ship, Sea.
How does DSC radio work?
DSC allows the radio to transfer information digitally, not just by voice, and to instantly send a digital distress alert to the Coast Guard. Part of that alert is a nine-digit Maritime Mobile Service Identity (MMSI) number that identifies the boat.
What is MF radio?
Medium frequency (MF) is the ITU designation for radio frequencies (RF) in the range of 300 kilohertz (kHz) to 3 megahertz (MHz). Part of this band is the medium wave (MW) AM broadcast band. The MF band is also known as the hectometer band as the wavelengths range from ten to one hectometer (1000 to 100 m).
What is DSC in GMDSS?
Digital Selective Calling (DSC) is part of the requirements for GMDSS. DSC supports 4 different call categories. These are, in order of priority: Distress. Urgency.
What is SSB MF HF?
MF/HF RT radio is often known as SSB radio. It is a transmitting-receiving system often referred to as a Transceiver (Tx/Rx), which allows the operator to either transmit or receive information by voice. MF/HF radios use SSB modulation for voice communication.
What VHF channel does DSC use?
Channel 70
Channel 70 has been designated the VHF/DSC digital call channel. DSC technology allows boaters to send a digital call directly to other DSC-equipped vessels and shore stations, somewhat like a telephone call. Once the DSC call has been confirmed, both parties are automatically switched to a working voice channel.
What is the difference between VHF and DSC?
The DSC radio retransmits any emergency signals received, so as long as another boat with a VHF-DSC radio receives the transmission, the effective range of a distress call can be many times greater than an individual boat’s VHF range.
What is MF frequency band?
Medium Frequency (MF): 300-3000 kHz Because medium frequencies afford stable transmission of radio waves over long distances, they are used primarily for medium wave broadcasting (AM radio), ship communications, LORAN (radio navigation), and other applications.
What is a MF radio?
What is AIS and DSC?
AIS also transmits a boats’ specific MMSI number and the vessels name allowing personal contact by Digital Selective Calling (DSC), avoiding vague descriptions (e.g. “ship off my port bow”). This can help to give warnings of close proximity or course corrections.
What mode is used for broadcast and MF HF DSC?
FEC (Forward error correction) mode is for one station to one or many stations type of communication. This mode is used for broadcasting the message. For example if a ship need to broadcast a distress telex message, FEC mode should be used.
Does DSC work without MMSI?
MMSI stands for Maritime Mobile Service Identity — think of this as a phone number for your boat. You must have registered an MMSI to take full advantage of your DSC radio.
What is the wavelength of MF?
Radio frequency spectrum
| Band name | Abbr | Frequency Wavelength |
|---|---|---|
| Medium frequency | MF | 300–3000 kHz 1 km – 100 m |
| High frequency | HF | 3–30 MHz 100 m – 10 m |
| Very high frequency | VHF | 30–300 MHz 10 m – 1 m |
| Ultra high frequency | UHF | 300–3000 MHz 1 m – 100 mm |
What is VHF in ship?
Marine VHF Radios are two-way communicators which are used to transfer and receive messages. However, the most important function of a Marine VHF Radio is that it is very helpful when it comes to sending distress signals across the channels to coast guards and other ships and boats in the periphery.