How do you calculate the length of a folded dipole antenna?

2019-05-24 by No Comments

How do you calculate the length of a folded dipole antenna?

The starting formula for the folded dipole calculation is the same as a dipole, 468 / Frequency (in MHz). Let’s try an example: Design a folded dipole for the 40 meter band. The frequency that is chosen might be 7.15 MHz. Plugging this in to the formula (468 / 7.15) gives a folded dipole with a length of 65.45 feet.

What is the length of a 40 meter dipole?

Read more about . . . . Dipole Length Calculations.

Approximate Lengths for HF Ham Band Dipole Antennas
Band (MHz) Length (Feet) Length (metres)
7.0 MHz (40 metres) 68.5 21.1
10.1 (30 metres) 47.5 14.7
14.00 (20 metres) 34.3 10.6

Why is dipole folded?

One of the main reasons for using a folded dipole antenna is the increase in feed impedance that it provides. If the conductors in the main dipole and the second or “fold” conductor are the same diameter, then it is found that there is a fourfold increase (i.e. two squared) in the feed impedance.

What is the length of a dipole?

The total length of the dipole is normally one-half wavelength though other lengths are used in certain cases.

Will a 40m dipole work on 15m?

Divide the 40m dipole by 3. There are two “hot points” both sides from the centre some 3.4m apart. They are “hot” only for 15m, and pretty “cool” for 40m. It means that if you connect short wires to these points, the resonance will move well down on 15m and move down verry verry slightly on 40m.

What is the length of a 40 Meter Dipole?

A 40 meter dipole is around 10.10 meters per side. As the fishing poles I had lying around were 8.70 meters this is what I used. Most of the mechanical construction is now ready. Wire length and support. The length of the fishing rods is 8.70 meters and yes, too short.

How do you calculate dipole antenna?

The formula to calculate the length of the antenna is 147/frequency in MHz, this gives the total length of the dipole in metres. For example, to make a 150MHz dipole: 147/150 = 98cm so each element of the dipole should be 49cm.

What is a center loaded dipole?

The centre-loaded dipole is a single band antenna most useful when there is insufficient space to erect a full size 1/2-wave dipole so most likely it will be used on the 40m and lower frequency bands.

What is a half wave dipole antenna?

A half wave antenna is a dipole (the antenna wire meets the elements. and the shield goes 1/4 wave in one direction and the center wire goes.