Tom Horne wrote:
On Oct 5, 12:50 pm, Jim Lux wrote:
Tom Horne wrote:
Hi
I'm anticipating converting my coax fed, ninety foot long, folded
terminated dipole to a ladder line fed folded dipole, without a
terminating resister, fed using an Icom AH-4 antenna coupler. Am I
correct in believing that the best ladder line to use for that purpose
would be the 300 Ohm type to match the nominal impedance of the folded
dipole itself.
Is this a multiband application?
If you want to keep all the wires, I'd make it a fat dipole (rather than
folded).
Why not put the AH4 at the feedpoint and feed with Coax? The box *is* a
bit heavy, but it is weatherproof, and you could run the power/control
wires alongside your coax.

Jim

Yes it is a multiband application. Why would I use an Icom AH-4
antenna coupler on a single band antenna?

Because the wire length was fixed for some other reason (installation
convenience) or you wanted to operate over a wider band than a regular
dipole would be acceptably matched for..

(mostly because you suggested having the AH4 in the first place)

What would be the
advantage to wiring it as a "fat dipole"?

Wider bandwidth of the underlying antenna, so potentially lower losses
in the tuner.
Redundant wires in case one breaks.
Less modification of the existing antenna.



--
Tom Horne, W3TDH