Antenna Calculator Help

The antenna calculator is an easy to use design tool to help you in choosing the best system to suit your needs. To run the calculator, you must first select the antenna parameters you want to test.

In the first category choose an Antenna model you want to test. If you are not sure of the model you want to use, click on the antenna name to take you to pages about it.

The second category is System bay Spacing: ERI offers a large variety of custom bay spacings. This simple program allows you to choose between either full wave or 1/2 wave designs. A full wave design offers better gain. The 1/2 wave design can produce a cleaner array. If you need a special design, please let us know.

Choose the Inter-Bay line o.d. you want to use. LP & LPX antennas will calculate when a 1 5/8" line is chosen. The calculator will calculate SHP & SHPX antennas with a 3 1/8" or a 4 1/8" line. When a LP or LPX antenna is calculated on 3 1/8" line, the calculator automatically upgrades the systems to MP or MPX.

Next determine the Antenna Input point. End fed antennas are the simplest and should be limited to 8 bays or less. Center fed designs offer better power distribution and allow a system to use beam tilt and null fill. If your system needs either beam tilt or null fill, please contact us.

Select the Radomes box if you have a moderate or severe icing problem. ERI systems have a fairly broad frequency response. With a low probability of ice forming at your site, factory field tuning may be all that is necessary to insure performance. With the Radomes box checked, weight and wind figures include 1/2" of radial ice. If the box is unchecked, weight and wind figures are of the antenna without radomes or radial ice. Electrical deicers are also available.

Input your operating Frequency in MHz. The calculator will compute systems that operate between 88 MHz and 108 MHz.

Next input your actual ERP (effective radiated power) your station will operate at your chosen antenna height.

With all the choices made, you can Calculate the parameters for your array. The calculator will try to determine if you have chosen a valid system. Adjust your parameters as necessary to produce a your best array.

You have to Calculate an array to View a Vertical Plane Plot.

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