What Is a Collinear Marine Vhf Antenna Review
When shopping marine electronics, information technology'due south easy to fall for a absurd new multifunction display or fifty-fifty a VHF/AIS philharmonic. But when it comes to shopping for parts such as transducers and antennas, where's the love?
For anglers, the right or best VHF antenna could hateful the deviation between finding a slap-up bite or enduring the skunk. On a more than serious note, it could rescue yous from a stranding or accident.
"If all things are equal — including antenna elevation and radio model — yous could go from a range of x miles to 25-plus miles just based on the materials in the antenna," says Chris Catoe, marine sales manager for the Shakespeare Antenna Group.
For that reason, nigh experts propose buying the best antenna you can afford. Prices range from about $thirty to more than than $300 for most recreational fishing vessels.
What is a VHF Marine Antenna?
"We accept sensitive receivers," says David McLain, national sales director for ICOM, makers of VHF marine radios. "But if you lot match one with merely a $thirty antenna, you lot're non going to get the range an ICOM tin get you."
At Shakespeare, VHF marine antennas are grouped into 3 categories that correlate to practiced, better and all-time products. Those categories are Archetype, Galaxy and Stage III models. Key differences eddy downward to what'south inside, whether coaxial cable, a combination of coax, brass and copper, or all brass and copper; brass and copper create the greatest efficiency.
However, before dissecting antennas, anglers should understand merely what an antenna is, says John Jones, vice president of engineering for Digital Antenna. "Information technology's a motorcar," he says. "People recall it'due south a piece of wire. Annihilation we build is a physically resonant circuit for the frequencies nosotros intend to use. An antenna converts electrical signals into photons — it'south a photon generator."
Catoe says consumers often call up, as well, that a VHF antenna transmits simply from its tip. "It radiates from the base up," he confirms.
Because of the energy surrounding the antenna and because the signals travel by line of sight, the antenna's placement aboard a vessel is central. Fifty-fifty the best antenna won't perform when placed too shut to some other antenna using like frequencies (AIS or another VHF), or when mounted as well low or too almost metal objects.
Marine VHF Antenna Pinnacle and Strength
Other considerations for choosing the right VHF antenna include antenna height and gain. Catoe says the vast bulk of powerboats in the 24- to 32-foot range do well using 8-pes antennas with 6-decibel (dB) gain. A three- to 4-foot antenna that's 3 dB is generally recommended for boats under 24 feet. Larger vessels can opt for 12- to 18-foot, 7 to eight dB antennas.
"As a general rule, antenna height should be less than one-half the length of the gunkhole," Catoe says.
Higher-dB antennas generate greater effective radiated power, and that can translate into greater range. However, the lower-dB antennas, such as a 3 dB stick, are recommended for vessels similar sailboats conveying antennas atop a tall mast that sways in high seas. The 3 dB antenna creates a larger signal blueprint, but that pattern doesn't travel as far, so information technology doesn't leave the horizon every bit dramatically when the boat pitches.
Anglers who ain VHF radios that are equipped with Automatic Identification Organization can employ one VHF antenna for both functions equally long as the AIS is receive-merely. If your AIS unit besides transmits, two antennas are necessary.
"We e'er recommend dedicated antennas for each," Catoe says. "Any time you split up something, y'all normally sacrifice something. Virtually people like to have both systems operating optimally."
Durable Marine VHF Antennas
In most cases, an angler breaks a VHF antenna earlier it dies of natural causes. "Antenna life span is difficult to establish. Some final ii years; some last 30," Catoe says. "It depends on how you're taking care of it, and which grade of antenna you purchased."
Better antennas accept UV blockers in the paint or they might be heavier-duty fiberglass or come with stainless steel rather than plastic mounts. Shakespeare recommends boaters launder their VHF antenna with lather and water whenever they wash the boat. Don't use abrasive detergents that can strip the finish off the fiberglass. Some boaters utilise wax, Catoe says, which will non interfere with the antenna function.
Tom Burden — senior production content editor for West Marine, which sells a variety of antennas, cables and connections — says that corrosion tin become a major problem, particularly at connection points.
If y'all experience radio issues y'all think come from the antenna, you tin always exam the betoken force by calling a friend on another boat, Burden advises. Have that friend start adequately shut and motility away until the signal fades.
Shakespeare too sells an ART-3 antenna meter. That unit tests the voltage standing-wave ratio, the output power, bombardment voltage and the radio's receiver. If the antenna is faulty, it tin be replaced. Well-nigh antennas come with three- to five-year warranties.
When you buy a new antenna or replace an sometime 1, chances are you won't run across the tech creep that plagues other electronics types. Physics more or less defines the applied science of an antenna, so it hasn't inverse much over time. Materials accept changed a little, but "the biggest trend I'k seeing," says Catoe, "is the combination of things: antennas or radios that have multifunctions (AIS and VHF together, or cellular and Wi-Fi). It's all well-nigh centralizing all product in a smaller footprint."
Source: https://www.sportfishingmag.com/choosing-and-using-marine-vhf-antenna/
0 Response to "What Is a Collinear Marine Vhf Antenna Review"
Post a Comment