Antenna Handbook

Super J Antenna Calculator

Here is a Super J antenna calculator:

Frequency (MHz): 145
Feed point height (m): 1

Element 1 length (m): 0.7071067811865475
Element 2 length (m): 0.3535533905932737

This calculator calculates the length of the elements of a Super J antenna for a given frequency and feed point height. The formula used is:

length = wavelength / 2 - feed_point_height

where:

length is the length of the element in meters
wavelength is the wavelength of the radio waves in meters
feed_point_height is the height of the feed point of the antenna in meters

The wavelength of the radio waves can be calculated using the formula:

wavelength = c / frequency

where:

c is the speed of light in meters per second
frequency is the frequency of the radio waves in hertz

For example, the wavelength of radio waves at 145 MHz is:

wavelength = c / frequency = 299,792,458 m/s / 145 MHz = 2.046 m

So, for a Super J antenna with a frequency of 145 MHz and a feed point height of 1 meter, the lengths of the elements would be:

Element 1 length = 0.7071067811865475 m
Element 2 length = 0.3535533905932737 m

This calculator is just a simple example, and there are many other factors that can affect the length of the elements of a Super J antenna. For more accurate results, you should consult a qualified antenna engineer.

do-it-yourself j antennas for 145 MHz drawings

Here are some do-it-yourself J antennas for 145 MHz drawings:

J-pole antenna: A J-pole antenna is a simple and effective antenna that can be made from a few materials. It is a good option for beginners who are looking to build their own antenna.
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To make a J-pole antenna, you will need:

* A piece of wire that is 1/4 wavelength long at 145 MHz.
* A connector for your radio.
* A way to mount the antenna.

The wire can be any type of metal, but copper is a good choice. The length of the wire will depend on the frequency you are using. For 145 MHz, the wire should be about 25 inches long.

The connector can be a BNC connector, PL-259 connector, or any other connector that is compatible with your radio.

The antenna can be mounted on a mast, a wall, or any other suitable surface.

Terminated J-pole antenna: A terminated J-pole antenna is a variation of the J-pole antenna that has a resistor at the end of the antenna. The resistor helps to absorb the radio waves that are not transmitted or received by the antenna. This helps to prevent the antenna from radiating harmful interference.

To make a terminated J-pole antenna, you will need:

* A piece of wire that is 1/4 wavelength long at 145 MHz.
* A resistor that is rated for the power output of your radio.
* A connector for your radio.
* A way to mount the antenna.

The wire and resistor can be the same as for a standard J-pole antenna. The connector can be a BNC connector, PL-259 connector, or any other connector that is compatible with your radio.

The antenna can be mounted on a mast, a wall, or any other suitable surface.

Folded J-pole antenna: A folded J-pole antenna is a variation of the J-pole antenna that has a second piece of wire that is folded in half. The folded wire helps to improve the radiation pattern of the antenna.

To make a folded J-pole antenna, you will need:

* Two pieces of wire that are 1/4 wavelength long at 145 MHz.
* A connector for your radio.
* A way to mount the antenna.

The wires can be the same as for a standard J-pole antenna. The connector can be a BNC connector, PL-259 connector, or any other connector that is compatible with your radio.

The antenna can be mounted on a mast, a wall, or any other suitable surface.

These are just a few examples of do-it-yourself J antennas for 145 MHz. There are many other designs available, and you can experiment to find the one that works best for you.

It is important to note that building your own antenna can be a challenging project. If you are not comfortable working with electrical equipment, you should consult with a qualified amateur radio operator.

LW Antenna Design

A longwave (LW) antenna is an antenna that is designed to transmit or receive radio waves in the longwave band, which ranges from 150 to 525 kilohertz (kHz). LW antennas are typically large and cumbersome, as the wavelength of longwave radio waves is very long.

Here are some of the most common types of LW antennas:

Vertical antenna: A vertical antenna is the simplest type of LW antenna. It consists of a single vertical conductor, such as a metal rod or pipe. The length of the antenna should be one-quarter of the wavelength of the radio waves it is designed to transmit or receive.
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Loop antenna: A loop antenna is a circular or elliptical antenna. It is made up of a single conductor that is bent into a circle or ellipse. The diameter of the loop should be one-half of the wavelength of the radio waves it is designed to transmit or receive.
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Ground-plane antenna: A ground-plane antenna is a vertical antenna that is surrounded by a ground plane. The ground plane is a conducting surface, such as a metal sheet or a network of wires, that is placed below the antenna. The ground plane helps to improve the radiation pattern of the antenna.
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Terminated antenna: A terminated antenna is an antenna that is terminated in a resistor. The resistor absorbs the radio waves that are not transmitted or received by the antenna. This helps to prevent the antenna from radiating harmful interference.
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The design of an LW antenna depends on a number of factors, including the frequency band it is designed to operate in, the desired radiation pattern, and the amount of space available.

If you are planning to build an LW antenna, it is important to consult with a qualified antenna engineer to ensure that the antenna is designed correctly.

Here are some of the things to consider when designing an LW antenna:

Frequency band: The frequency band that the antenna is designed to operate in will determine the length of the antenna.
Radiation pattern: The radiation pattern of an antenna describes how the radio waves are emitted from the antenna. There are many different radiation patterns that can be used for LW antennas.
Space available: The amount of space available will determine the size and shape of the antenna.
Cost: The cost of the antenna will depend on the materials used and the complexity of the design.

Once you have considered these factors, you can start designing your LW antenna. There are many resources available to help you design an antenna, such as books, websites, and software programs.

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