Does length of antenna matter?

So the answer is yes, size does matter, but bigger isn’t always better. It all depends on what your transmitting and receiving frequencies are. Theoretically, a longer antenna will have a greater range, but it is far more important for optimal radio performance that the length of the antenna matches the frequency.

How far apart should VHF antennas be?

According to the standard, satellite TV antennas should be three feet away from VHF antennas and GPS antennas, and VHF antennas need to be no less than three feet away from GPS antennas.

How long is a 900 MHz antenna?

The cable comes in a standard 79” length or optional 180” length and a screw-on RP-SMA coax connector. The antenna has flexible dipole shafts and offers a horizontal Omni directional pattern when shafts are mounted vertically with a minimal vertical sensitivity.

How far apart should mobile antennas be?

My rule of thumb is that antennas should be 35-50 feet apart or more if you’re looking at an open space like a warehouse or cubicle farm, less if you are looking at boosting through walls. The best thing to do is not to make assumptions. Start with one antenna and try making calls from different distances.

Is a higher dBi antenna better?

The higher the dBi number of the antenna, the higher the gain, but less of a broad field pattern, meaning that the signal strength will go further but in a narrower direction, as illustrated in the diagram below.

Do antennas interfere with each other?

Placing two antennas within ~1/2 wavelength of each other will cause them to inductively couple – effectively connecting themselves to each other. This results in detuning both antennas, as well as the high power Tx RF getting routed back down the other antenna, possibly damaging the receiver.

Can you put 2 antennas next to each other?

Adding a second antenna can increase the signal path coverage and give you a more consistent signal. To accomplish this you will need a combiner or coupler that can combine the two antennas together. I would recommend that you use two identical antennas. This will ensure a balanced signal path and coverage.

How far can 900 MHz travel?

1500 feet
The lower frequency radio waves of 900 MHz radios provide greater penetration through walls, trees and other obstacles, making it optimal for most non-line-of-sight applications. A typical AW900xTR Radio using high powered AW-15 15dbi antenna can go distances of up to 1500 feet with buildings and/or trees in the way.

Does 2.4GHz require line of sight?

Using a Lower Frequency If you take a reading in the next room you will see that the 2.4GHz signal is stronger than the 5GHz (in most cases). For this reason, high frequency microwave links such as 60 and 80GHz require perfect line of sight, whereas 5GHz links can often punch through trees and bushes etc.

How close can 2 TV antennas be?

The easy answer is that you should maintain a minimum mounting distance of at least 1/4 wavelength apart for the lowest frequency antenna within the same horizontal plane. For VHF antennas, that translates to roughly 19 inches.

Are there any antenna projects for 144 MHz?

Antenna projects for 144 MHz category is a curation of 148 web resources on , Feed line Dipole for 2 Meters, OCF 2 Meter Sleeve Dipole Antenna, The Tiny 3. Resources listed under Antenna for 2 meters category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators.

How to mount a 144 MHz coaxial dipole antenna?

Portable 2m (144.2 MHz) 1/2 wave Coaxial Dipole mounted on a 1 metre extension. To elevate the antenna add additional 1 metre pipe extensions as required. You may need a guying ring a guy ropes for two or more extensions. Place the guying ring over the top T-piece below the 9T choke.

How to calculate the length of a dipole antenna?

468 / frequency (MHz) = length of wire in feet. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. The results are conveniently displayed in inches, centimeters, feet and meters. This formula to obtain the length of a half-wave dipole antenna will give a good ballpark value to start with.

How to calculate the length of a half wave antenna?

The Half-Wave Dipole Antenna The most widely used formula to calculate the approximate overall length of wire required for a dipoleis:468 / frequency (MHz) = length of wire in feet.

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