COMUNICATIONS MATH

 

There are numerous formulas and equations that pertain to the communications business. Many of these are very complex and probably beyond the primary (majority) of hobbiest. We will start this page with some of the basic math concepts. You might find some of these helpful, or just interesting.

 

I know the frequency of my transmitter. What is the wavelength?

In meters: 300 divided by frequency in MHz

In feet: 984 divided by frequency in MHz

In inches: 11,811 divided by frequency in MHz.

 

 

I know the wavelength of my transmission. What is the frequency?

300 divided by wavelength in meters equals frequency in MHz. Example, What frequency has a 6 meter wave length? 300 divided by 6 equals 50 MHz.

 

 

I want to build a straight wire antenna. How do I calculate the length I need?

Full wave: 984 divided by frequency in MHz equals the length in feet

Three-quarter wave: 738 divided by frequency in MHz equals the length in feet

Five-eighths wave: 615 divided by frequency in MHz equals the length in feet

One-half wave: 492 divided by the frequency in MHz equals the length in feet

One-quarter wave: 246 divided by the frequency in MHz equals the length in feet

 

 

What is the formula for converting meters to feet?

Meters multiplied by 3.281 equals an equivalent length in feet.

 

 

What is the formula for converting feet to meters?

Feet multiplied by 0.3048 equals an equivalent length in meters.

 

 

What are some other common conversion formulas?

Inches multiplied by 25.4 equals an equivalent length in millimeters.

Inches multiplied by 2.54 equals an equivalent length in centimeters.

Inches multiplied by 0.0254 equals an equivalent length in meters.

Millimeters multiplied by 0.03937 an equivalent length in inches.

Meters multiplied by 39.37 equals an equivalent length in inches.

 

 

11/18/08