The PL-259 connector should be securely fastened or soldered to the end of the coaxial cable. It is designed to be thrown.
If several otherwise equal radios try to contact a single receiving radio the higher gain antenna is the one the receiving radio will be more likely to hear.
Why is the height of a vhf radio antenna important. However when it comes to verticals height isnt so important as long as the ground losses are low. This fact is why height above true ground is so important to horizontal antennas. You know waves need to travel in the air to let two devices connect.
A beam type of antenna at a height of 70 feet or more will provide greatly superior performance over the same antenna at 35 feet all other factors being equal. If theres more than one VHF antenna they should be separated at least one-half wavelength three to four feet from each other to avoid the 25 watts of transmit power from the VHF radio going straight into the AIS receiver circuitry potentially damaging it. Antenna height more than any other factor determines how far you can transmit.
Radio operators typically want to get the best performance and range out of their antenna systems. Your antennas height is directly related to your reach. Catoe says the vast majority of powerboats in the 24- to 32-foot range do well using 8-foot antennas with 6-decibel dB gain.
Why is the height of a VHF radio antenna important. Trees house and the like will all absorb radio signals especially at VHF and UHF. A 3- to 4-foot antenna thats 3 dB is generally recommended for boats under 24 feet.
The cable should be free of kinks nicks and abrasions. The elevation height above ground particularly height above surrounding terrain of a VHF radio antenna is a key issue in the area of communications because VHF radio is relatively line-of-site. One of the main advantages of increasing the height of an antenna is that it raises the antenna above the items that might obstruct the antenna.
There are a couple of ways to accomplish this. It should be corrosion-free and securely screwed into the VHF radios antenna port. One of the most common questions we hear is why the height of the marine VHF antenna is important.
Antenna gain is important. VHF and UHF propagation is typically line of site so the common thought to increasing range is to increase the antenna height. Which of the following is a feature of a Type IV PFD.
It impacts the amount of power loss from the radio itself as well. Also check the antenna cable for any signs of weathering or breakdown from sun exposure. An antenna mounted up high can see farther over the horizon.
With all the surrounding weve got today around us whether its the buildings trees or whatever these signals got too many obstacles around them. Nothing affects the performance of your VHF radio more than antenna height. Which type of fire extinguisher should be onboard a vessel with a permanently installed fuel tank.
Why is the height of a VHF radio antenna important. A 5 W radio on flat ground can probably talk for 5-10 miles if youre lucky. The angle of radiation from a horizontal antenna is rather dependent on the ground conductivity under the antenna.
VHF is line of sight communication only as the signal travels in a straight line like visible light. The simplest answer is that VHF radios work off line of sight so a taller antenna will increase your line of sight meaning you will be able to transmit and receive broadcasts from further distances. A taller antenna will be able to see further over the horizon and thus have longer range.
The reach for transmissions is equal to 142 times the square root of the antennas height. To understand the importance of a proper height it is necessary to understand how electromagnetic waves travel in an environment. Angle meaning that an antenna must be placed high above the ground in terms of the wavelength of the radio wave being transmitted.
VHF radios work by the line of sight principle. For communications to be effective the receiving antenna must be able to see the waves coming from the transmitting antenna. Other considerations for choosing the right VHF antenna include antenna height and gain.
This because VHF waves travel in a straight line and become weaker over greater distances. It is important to remember that VHF radio waves are low-frequency waves which have a longer wavelength than very high-frequency waves such as UHF. Essentially it is a straightforward equation.
Antenna height for VHF UHF At VHF and UHF radio propagation tends to be more line of sight although not always. The antenna height above ground especially in urban areas on the HF bands poses a set of unforeseen issues that an average radio amateur is often blissfully ignorant about. A height of 120 feet.
You might have asked yourself this question one time or another.