Originally Posted by BlackhawkSP
First of all, the GS frequencies are 329 to 335 MHZ. If you used the listed 234/113, that's why your math is not working out.
Using the formula of WAVELENGTH X FREQUENCY = SPEED OF LIGHT (C) and run the numbers for the middle of the band for GS frequencies, the math works out as 35.55 inches for a full wave antenna. This makes the exact length of the stripped portion of a 1/2 wave antenna at 17.78 inches. The 16 to 17 inches of the stripped center conductor of a piece of coax stuffed down the gear leg of my 8 has worked perfectly for years.
Would do it again in a second:-).
I had to get the calculator out and shake off a few cobwebs in the brain on that one:-)....
You misunderstood my post. At the beginning of my post I said I was making a VOR and GS
I wrote 234/113 Mhz (middle of frequency range) = 2.07 feet not 16" !
where the 113 Mhz is the center of the VOR range 108 - 117.95
234 divided by 113 = 2.07 feet x 12 = 24.84 inches for a VOR ( radiating element ) dipole.
If I were going to make it for the GS only
I'd use the shorter antenna :
234/332 Mhz (332 is the middle of 329 to 335 Mhz) = 0.70 feet x 12 = 8.45 inches for the radiating element of the 1/2 wave dipole.
So my numbers were correct for a VOR antenna where apparently the 16" is what some are using for the GS only antenna. At least that cleared up where they got the 16".
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