General Exam Questions
 

Could someone please help me understand how this 1/2 wavelength and
1/4 wavelenght thing is measured?? I'm trying to get a handle on how
to figure out what a wavelength is or how you measure one. Antenna
height and so forth are all figured according to set formulas,
right??

Thank you very much.

General Exam Questions
 

On Jan 4, 10:59*pm, "Brenda Ann" wrote:
wrote in message

...

Could someone please help me understand how this 1/2 wavelength and
1/4 wavelenght thing is measured?? *I'm trying to get a handle on how
to figure out what a wavelength is or how you measure one. *Antenna
height and so forth are all figured according to set formulas,
right??

Thank you very much.

Wavelength (m) = 300/f

Examples:

146 MHz (2m amateur)
300/146 = 2.05m (rounded to the nearest 100th)

10 MHz (WWV)
300/10 = 30m

440 MHz (70cm amateur)
300/440 = .068m (rounded to the nearest 1000th)

To compute half wave in meters simply divide by 2

To compute quarter wave in meters simply divide by 4

For real world applications of antenna building, you would want to do the
following:

For a driven (active) element, multiply your result by .95

For a reflector element leave as is.

For a director element, multiply your result by ~.90

These will not be precise, but they are practical, and do work well.

Well, I'll be printing this e-mail out and putting it under my pillow
at nite.

THANK YOU VERY MUCH.
Wish me luck.