  Antennas Probably the best DX site in the world DX news   The formulas for calculating T2FD dimensions are as follows.

1. The length of each leg ("A'') from the center is equal to 50,000 divided by the lowest desired operating frequency (in kHz) and then multiplied by 3.28. The answer is in feet.

2. The spacing between radiating wires ("B") is equal to 3000 divided by the lowest desired operating frequency (in kHz) and then multiplied by 3.28. The answer is in feet.

3. The sloping angle for a non­directional pattern should be on the order of 30, but 20–40 is acceptable.

Example:
To design a T2FD for the center of the 90 meter band (3300 kHz) and up:

 Desired frequency Spacing Leg "A" (50.000 / 3300) x 3.28 49.70 feet Leg "B" (3000 / 3300) x 3.28 2.98 feet

Total length of the antenna would be 99.4 feet (2 x 49.7), and the width would be 2.98 feet ("B").

The total wire used to complete the loop equals 204.76 feet (4 x 49.7) + (2 x 2.98).  Front page DX News Logs Andes DX Antennas DX Lab In Print Web Stories Archives Web Archive Mail Archive Search Search all HCDX mail since 1995 About us About us Write to us Copyrights FAQ HCDX mail list  antennX Cebik FM antennas Werner's links Antenna Elmer Coax basics DX-Tools.com