Technical vertical question
 

If you have a Ground Mounted, or an Above Ground Mounted vertical, can
you create a lobe by placing your radials pointed in the direction you
want the lobe to occure? or, does the lobe occure in the opposite
direction from which you have the radials pointed?

What is the optimum length for radials:

1/10 wavelength?

1/4 wavelength?

1/4 wavelength plus 2%?

1/2 wavelength?

1 wavelength?

2 wavelengths?


Is the optimum wavelength a function of where the vertical is mounted?
i.e. Ground Mounted or Above Grounded Mounted.

Thanks for your help.

William
http://LiveToBe100.org
- Retirement News -

Technical vertical question
 

Testing has shown no discernable difference in a vertical pattern when
certain directions are favored with the radial system.
So many hams feel they get best performance from end fed halfwaves
with 4-7 "counterpoise rod", and are only fooling themselves. A 1/4w
vertical with 60 on gorund radials is a very
efficient antenna on long hauls.
Good luck,
Jim

Technical vertical question
 

A lot of questions in one post...
You can get some of these answers by downloading the demo package of
EZNEC. I dropped a radial from one of my test cases and found the
pattern was less on that side of the azimuth display.

Modeling buried radials is beyond my talents.
In general, more is better and longer is better. The jury is still out
in most cases.

Most of your questions are addressed in the 20th Edition Arrl Antenna
Handbook.

You can use Google to search in the Groups and also find answers to
most of your questions but that is the least reliable source that I
use. Beware of experts who use assumed names, especially!

Consider any advice from me as coming from a student in spite of old
call and the Social Security Check!

On 24 Feb 2006 20:32:05 -0800, "LiveToBe100.org"
wrote:

If you have a Ground Mounted, or an Above Ground Mounted vertical, can
you create a lobe by placing your radials pointed in the direction you
want the lobe to occure? or, does the lobe occure in the opposite
direction from which you have the radials pointed?

What is the optimum length for radials:

1/10 wavelength?

1/4 wavelength?

1/4 wavelength plus 2%?

1/2 wavelength?

1 wavelength?

2 wavelengths?


Is the optimum wavelength a function of where the vertical is mounted?
i.e. Ground Mounted or Above Grounded Mounted.

Thanks for your help.

William
http://LiveToBe100.org
- Retirement News -
John Ferrell W8CCW

Technical vertical question
 

There is no such thing as an 'optimum' length of radials.

There is only an economic limit to what your bank balance can afford
in terms of number of dollars per S-point.

Most people's bank balance and lumbago problems run out when there are
half a dozen radials of about 15 feet in length.
----
Reg.