RadioBanter - View Single Post

March 26th 05, 01:16 AM

wrote:

Tom Ring wrote:

Tom Ring wrote:

I have a coworker that would like to put up a 40m antenna on his

tower

that has some gain and directivity. I have modeled a few things,

and

while they are fairly satisfactory, I wanted to see what ideas the

group

had.

The approximate limitations are as follows -

o Boomlength 30 feet
o Element length 30 feet
o Any vertical components are max -10 feet from the plane of the

boom

and elements. The reason here is that it's a crankup, and his roof

clearance would be about 10 feet when lowered.

It would be desirable to have both CW and phone covered, but phone

only

is ok.
It will need to be coax fed.

Thanks.

tom
K0TAR

So, no ideas? At all? I thought better of the group.

You are asking near impossibility, that is why there was no response.
QST had an Article on short, loaded beams, and W4RNL has written an
excellent Article on the same. Check those out.
Are you wanting to build or buy? This group, whom you don't think
much of, is mostly about design and building.
Gary N4AST

I haven't asked anything impossible or even tough, since I only gave a
general bound on size, gave the rough band limits desired, and said we'd
like gain and directivity.

As far as building goes, I've built about 20 times more than I've
bought, so that's not an issue.

And where did I say I didn't think much of the group? I think the group
is a wealth of ideas, creativity, knowledge and reason when they aren't
bickering. I have learned a lot here reading threads, and also learned,
to my regret, how much math has slipped from my grasp from lack of use
over the years.

tom
K0TAR