What is a VHF radio used for?
Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship, ship-to-shore (for example with harbormasters), and in certain circumstances ship-to-aircraft.
Is VHF the same as FM?
VHF- Very High Frequency
Very high frequency is commonly used for FM radio broadcast, two-way land mobile radio systems, long-range data communication, and marine communications, just to name a few. VHF includes radio waves from 30 MHz to 300 MHz.
What VHF channel should I use for a radio check?
If you have a VHF marine radio, tune it to channel 16. Unless you know you are outside VHF range of shore and ships, call on channel 16 first. Distress signal “MAYDAY”, spoken three times.
Can a VHF antenna be used for FM?
You can use both but your vhf will over ride your am/fm when you key your mike. In other words, your am/fm radio will go silent whenever you key down. They are also very easy to install. Yes, you can use them both at the same time.
Do police use UHF or VHF?
Public Safety SpectrumFrequencyMHz Available for Public Safety25-50 MHz (VHF Low Band)6.3 MHz150-174 MHz (VHF High Band)3.6 MHz [non-contiguous]220-222 (220 MHz band)0.1 MHz450-470 (UHF Band)3.7 MHz [non-contiguous]
Do I need a Licence for a VHF radio?
The Marine Radio Short Range Certificate remains a legal requirement for the use of marine VHF. All radios require the user and the vessel to hold a relevant licence. The vessel’s licence is like a car tax disc, but is also the key to obtaining an MMSI number, which will uniquely identify your vessel.
How far does FM radio travel?
What are the radio frequencies?
Frequency bandsFrequency rangeWavelength rangeITU designationFull name3–30 kHz100–10 kmVery low frequency30–300 kHz10–1 kmLow frequency300 kHz – 3 MHz1 km – 100 mMedium frequency
What frequency range is used for FM radio transmission?
FM radio uses frequency modulation, of course. The frequency band for FM radio is about 88 to 108 MHz. The information signal is music and voice which falls in the audio spectrum. The full audio spectrum ranges form 20 to 20,000 Hz, but FM radio limits the upper modulating frequency to 15 kHz (cf.
What do you say for a radio check?
Response to “Radio Check”. Means your transmission signal is good. Also, use “Read you 5-by-5”. You are asking the other party to acknowledge they hear you.
How do I test a VHF radio output?
You are encouraged to check your VHF radio by calling the station in your area. When you transmit on its channel, you will hear a recorded response and then hear a playback of your voice verifying that your radio is transmitting, modulating and receiving.
How do I ship to shore radio?
Use an “open channel” to performance the check (channels 68, 69, 71, 72 and 78A). Turn radio to one-watt power setting, and key the microphone. Call “radio check” three times, followed by your boat name and location. Wait for a reply confirming someone has heard your transmission.
Does a VHF antenna need to be grounded?
Do I need a ground plane for a VHF antenna? Not necessarily. Shakespeare VHF and CB Marine Band antennas are designed with independent ground planes built in. SSB antennas, on the other hand, must be properly grounded.
How long should a VHF antenna be?
Larger vessels can opt for 12- to 18-foot, 7 to 8 dB antennas. “As a general rule, antenna height should be less than half the length of the boat,” Catoe says. Higher-dB antennas generate greater effective radiated power, and that can translate into greater range.