[Lowfer] vertical

Tue, 25 Feb 2003 17:47:02 -0600

So you only need the input DC current to calculate the impedance of the
vertical??? The field strength goes down every time it warms up past 32F. I
bet it will choke when the leaves come out in a couple of months. Lyle has
some good signal measurements of the vertical verses the loop, which is
pointed at him. The vertical is 6db down from the loop all the time in below
freezing temps. He can come up with how bad the leaves effect the vertical
this spring. I do plan on running both the loop and vertical on 136kc so it
will be interesting if I can radiate enough signal with the vertical with
the legal limit of power input and a fully leaf covered set of trees out
back. I know the loop will work without any influence from the weather or
seasons.

Mike>WE0H
http://www.we0h.us/lf

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Bill Ashlock
Sent: Tuesday, February 25, 2003 9:41 AM
To: [email protected]
Subject: RE: [Lowfer] vertical

Mike,

>NOT.

Really!

>My 45' vertical has the ends of the 72' flattop about 25 or 30' off the
>ground.

Running your numbers through my calculator I see you have a 25 to 34 degree
droop - far from a 45deg (bad) angle.

>It is buried in the trees and still makes an occasional 1,304-mile
>trip.

Along with the 500(+)pf of capacity (assuming there are a number of top hat
radials within the 72ft) this antenna SHOULD do pretty well. I'd ask you
what the system resistance is (as a figure of merit) but that would require
measuring the input current (power?).

Wait till warmer weather when the tree sap finds it's way up the branches!

Bill