Helix RC2072 Oxford Scientific Calculator,Black,22 x 14 x 2.2 cm

Product Information

Resonant frequency (Rf). The frequency at which the inductive reactance equals the capacitive reactance:

This is a simple helical antenna calculator that I've been using for my antennas and dish feeds, originally I had it only in a private spreadsheet document. It is based on the book "Antennas For All Applications" by John D. Kraus and Ronald J. Marhefka and the "ARRL Antenna Book". Calculation Example: Suppose we have a helix with a pitch of 1 m, a radius of 0.5 m, and 3 turns. We want to find the length of the helix. Using the above formula, we can calculate the length of the helix as sqrt((2 pi3 1) A HELIX is a three dimensional spiraling circular object. The most common application of the helix shape is in the common spring. A helix has a height or length, diameter and pitch, where pitch is the measurement between the spirals (see diagram). Helix Calculators:

... with matching Coax to 50 Ω

To calculate the helix length, the calculator uses the Pythagorean theorem to find the hypotenuse of a right triangle, where the rise of the helix is the height of the triangle and the circumference of the helix is the base of the triangle. The hypotenuse of the triangle is the helix length. To calculate the length of a helical antenna, multiply the circumference of the helix by the wavelength of the signal. Divide the result by 4 times π. What is a Helical Antenna?

where HXL is the helix length, R is the rise of the helix in one revolution, and C is the circumference of the helix. Same as operating frequency F, except converted to wavelenght. Intermediary value used in other equations mainly for simplicity. For the purposes of this calculator, the wavelength is expressed in millimeters. Helix circumference - real (C)This is an estimation of how much conductor (wire, tubing, ...) you will need to wind the helix. Once again, this does not consider things like impedance matching or build imperfections, so always leave yourself some extra length if you are cutting it beforehand. Ideal diameter of helix conductor (d)