Roger,
Take a look at this. I am thinking of building one this summer and hang
it from a tall tree.
https://www.yccc.org/Articles/double_l.htm
73 Mark N1UK G3ZZM
On 23-Mar-21 6:33 PM, Roger Kennedy wrote:
Guy (K2AV) - I really liked your explanation about the function of a radial
field
Hi, Roger
It sure seems like a lot of confusion arises when folks attempt concise
electrical and mathematical thoughts and calculations using words with very
broad and fuzzy definitions. Words like radial, vertical, topload, etc.
can mean different things and can create remarkably confusing
Kennedy
Sent: Tuesday, March 23, 2021 3:33:53 PM
To: topband@contesting.com
Subject: Topband: New Subject: 160M array feedline question
Guy (K2AV) - I really liked your explanation about the function of a radial
field on a 160m vertical . . . and how the radials don't actually radiate.
But I've
:53 PM
To: topband@contesting.com
Subject: Topband: New Subject: 160M array feedline question
Guy (K2AV) - I really liked your explanation about the function of a radial
field on a 160m vertical . . . and how the radials don't actually radiate.
But I've often thought about the other extreme
Guy (K2AV) - I really liked your explanation about the function of a radial
field on a 160m vertical . . . and how the radials don't actually radiate.
But I've often thought about the other extreme . . . I have a homebrew 2m
Ground Plane on top of my mast . . . just a quarter wave vertical . .
Inspect your feedline you plan to use (sounds like it is Heliax) and
make sure the jacket is undamaged. If it is okay, you can bury it or
just lay it on the ground and it won't matter if water covers it. Of
more concern is keeping the junction where the feedline divides dry.
If you use enough
Interesting page on the subject here ;
https://ham.stackexchange.com/questions/3675/what-is-the-effect-of-using-different-number-of-radials-with-ground-plane-antenn
On 23/3/21 1:55 pm, Guy Olinger K2AV wrote:
A counterpoise is what we do when the full size of a double-ended
antenna, dipole,
A counterpoise is what we do when the full size of a double-ended antenna,
dipole, OCF, etc is too large for us to build, maintain, etc. Very simply,
we want to jam the energy from the shield of our coax into the
counterpoise, and the energy from the center conductor into the radiating
element,
Recycling signals at the feedpoint sounds more like a mismatch swr
situation.
The ground radials form half of the antenna, and that radiation from
ground, in phase with the vertical radiation determines the field
strength and take off angle.
vk4tux
On 23/3/21 11:31 am, Charles Moizeau
Brown
Sent: Monday, March 22, 2021 20:40
To: topband@contesting.com
Subject: Re: Topband: New Subject: 160M array feedline question
On 3/22/2021 2:41 PM, Carl Braun wrote:
> Some brought up the idea of my ground mounted radials becoming submerged in
> fresh water...however, that would onl
On 3/22/2021 2:41 PM, Carl Braun wrote:
Some brought up the idea of my ground mounted radials becoming submerged in
fresh water...however, that would only take place for a week or less during the
spring here and, it would only happen if we had a slow snow pack melt and rain
at the same time.
Topbanders
Thanks to all who responded
I received a lot of good advice and will be taking it. Specifically, the
advice to bury the hardline rather than elevate it.
Some brought up the idea of my ground mounted radials becoming submerged in
fresh water...however, that would only take place
If the radials have a good chance be being submerged in fresh water, I would
consider elevating the radials.
Had an experience here where my 40 radials on each of my 4 square verticals
were often times below the water level and radiation efficiency dropped like a
rock. Great receive
What's the perceived problem with the cable being submerged?
Wes N7WS
On 3/21/2021 1:25 PM, Carl Braun wrote:
Hello Topbanders
I am currently awaiting the snow to melt here in the Northwoods of Wisconsin before starting
the construction of my low band vertical array. My verticals will be
Hello Topbanders
I am currently awaiting the snow to melt here in the Northwoods of Wisconsin
before starting the construction of my low band vertical array. My verticals
will be mounted in a low ground area near a lake and the area tends to get wet
and sometimes floods in the early spring.
15 matches
Mail list logo
