Topband: Flattop with 450 Ohm feeders

[Bill]

Dipoles are very forgiving.  I have an 80 meter dipole up about 80 feet
between 2 trees.
But, I could only fit about 80 feet horizontally.  The remaining 40 feet (20
ft on a side),
hangs straight down along the tree trunk.  This antenna while not the best,
works great and
even tunes up on 160.

K2WH

-----Original Message-----
From: topband-bounces at contesting.com
[mailto:topband-bounces at contesting.com]On Behalf Of Bob Marzari
Sent: Wednesday, August 13, 2003 4:52 AM
To: Topband at Contesting. Com
Subject: Topband: Flattop with 450 Ohm feeders


I have put up an antenna for my daughter-in-law KB3AGR that is ( 130 feet,
as much wire as I could stretch between two trees) feed with  50 feet 450
Ohm ladder line to a balun under the eve of the house. This is a current
balun sold by Radio Works and is supposed to have a very short coax run from
it to the radio. That run is 25 feet of LMR400.

I was trying to get this to resonate on 160 until I found out that her
Kenwood 690AT does not tune 160. It tunes all the other bands great. Now the
question.

If I cut the flat top to be resonant do I include the feeders in the length?
I constructed this antenna looking at the ARRL 19th edition of the Antenna
Handbook, page 7-3.

If the flat top has to be longer, can I add a droop to each end?

Thanks,

Bob, W3PT

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