# How do you calculate 1 4 wave antenna?

## How do you calculate 1 4 wave antenna?

1/4 wave length antenna take 300 and divide by the frequency. So 150 MHz becomes 2 meters, 300 MHz becomes 1 meter, 600 MHz becomes 1/2 meter. Then take the length in meters and multiply by 3.28 to convert to feet (unless you want to remain metric). Take that result and divide by 4 for 1/4 wavelength.

## How much gain does a 1/4 wave vertical antenna have?

A 1/4 wave vertical ground mounted has lobes from 10 to 55 degrees and has gain of approximately 3 to 10 dBd. The lift off angle, which is not often mentioned, is 0.35 wavelength from the base of the antenna, where the current is maximum.

What is the gain of a 1/4 wave antenna?

Gain over 1/4 wave is 2.85db assuming NO matching system losses. The same infinite-ground plane antenna, with a matching coil Q of 100, the 5/8th wave has 2.6dB gain over the reference 1/4 wave. This is over an infinite size perfect ground extending to infinity.

### What is the approximate length for a 1/4 wave vertical antenna cut for 28.5 MHz?

8 feet
What is the approximate length for a 1/4-wave vertical antenna cut for 28.5 MHz? The approximate length of wire to cut for a 1/4 wavelength vertical antenna for 28.5 MHz is 8 feet.

### What is the length of quarter wave antenna?

Therefore the length of the antenna is determined by the wavelength of the radio waves it is used with. The most common form is the quarter-wave monopole, in which the antenna is approximately one quarter of the wavelength of the radio waves.

How to calculate 1 / 4 wave ground plane antenna?

1/4 Wave Ground Plane Antenna Calculator Give me the results in… mm (MilliMetres) cm (Centimetres) m (Met A. Vertical Monopole Radiating Element ( B. Radials (λ*0.28)*vf Actual wavelength

#### How many radials are needed for a quarter wave antenna?

This calculator can be used to design a Quarter Wave Ground Plane antenna, with radials. The radiating element is a quarter wave (λ/4) and the radials are 12% longer. There are usually four radials, three being a minimum, but you could use up to six.

#### How to calculate the dBW of a coaxial cable?

You can use the Power Compensator to calculate dBW. Just enter any power in watts and the calculator will convert it to dBW. You can use the Coaxial Length Calculator for any cable that is not shown in the table providing you know the velocity factor and loss per 100m at any frequency you wish to use.

Is there a free coaxial cable length calculator?

You can download Coaxial Length Calculator for free but you will need Microsoft Excel to use it or another spreadsheet program capable of using Excel. You can see from the screenshot below a comparison table of coaxial cables. 23/08/2019