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What is inside a VHF antenna?
There inner electrical element (the part that radiates and receives signals) of VHF antennas is generally made of one of three types of materials: coaxial cable, copper or brass. While all provide acceptable performance, better antennas use brass or copper for optimum performance and durability.
Do marine VHF antennas go bad?
Marine VHF antennas almost never go bad, unless they are physically damaged or water is allowed to intrude into the loading coil.
What is 3dB antenna?
A 2dB or 3dB gain antenna is the compromise in suburban and general settings. A 5dB gain antenna radiates more energy toward the horizon (compared to the 0, 2, and 3dB antennas) to reach radio communication sites that are further apart and less obstructed. Therefore, they are best used in flatlands and open areas.
How do I test my VHF marine antenna?
This is the most common test because SWR meters are widely available, inexpensive, and easy to use.
- Disconnect the antenna at the masthead.
- Connect the VHF radio to the SWR meter, and the other port of the SWR meter to end of the coax that was connected to the radio.
- Repeat with antenna connected.
How far does marine VHF transmit?
Your VHF radio is intended mainly for short range communications, generally 5-10 miles, and at least 20 miles to a USCG station. To communicate at longer ranges, you will normally need a satellite telephone or an MF/HF marine radiotelephone.
What kind of base does a VHF whip antenna need?
We engineered our powerboat and sailboat marine VHF whip antennas with an ultra tough stainless steel base for increased performance and durability. Our marine VHF whip antennas are built to withstand years of use on your vessel, ensuring that you have reliable communication for years to come.
Which is the best VHF antenna for the Marine Corps?
Best Marine VHF Antennas. 1. Shakespeare 36-Inch Low-Profile Stainless Steel VHF Antenna. 2. Tram Marine Heavy-Duty Stainless Steel “L” Bracket VHF Antenna. 3. Tram Heavy-Duty Thick Stainless Steel VHF Antenna. 4. METZ COMMUNICATION CORP Manta 6 Marine VHF Antenna.
What kind of antenna do you need for a sailboat?
For masthead mounting, short 3dB stainless steel “whip” antennas create less windage and provide the appropriate wide radiation pattern required by a heeling sailboat. Small powerboats may also use stainless whip antennas because they are rugged. Fiberglass tube antennas vary in quality.
Why is it important to place an antenna on a vessel?
Because of the energy surrounding the antenna and because the signals travel by line of sight, the antenna’s placement aboard a vessel is key. Even the best antenna won’t perform when placed too close to another antenna using similar frequencies (AIS or another VHF), or when mounted too low or too near metal objects.