"Telamon" wrote in message
...
In article . com,
"junius" wrote:

Hello folks,

I have a question here... I recently bought one of these excellent Par
Electronic EF-SWL antennas.

As the supplied radiator can be disconnected and another wire be hooked
onto the 9:1 transformer, I was thinking to give a go at hooking up a
150 foot length of wire that I have on hand. My question is this: in
hooking up an alternate wire to the transformer, would the antenna lose
its characteristics as a 1-30 MHz antenna? Would an antenna tuner then
be required?

Very curious for info on this. I'm afraid I don't know too terribly
much about antenna theory.

Thanks in advance for any help provided,

Just give it a try and see if it works well for you.

The impedance of the wire is determined by its diameter and height above
ground not the length. The 9:1 UNUN is a good choice.

--
Telamon
Ventura, California

Hi Junius et al,

There is no magic about the 45' length. It is a nice tradeoff between
performance and ease of deployment. The military also had a bit of a say so.
Anyway, the transformer looks good to well below MW, so that is not an
issue.
The longer length, as one poster suggested, will improve MW performance. If
the antenna is high (in terms of wavelength) a number of nulls (in addition
to multiple gain lobes) will be seen at HF. Neither is very useful as the
antenna cannot be rotated.
Some receivers may overload with the increased signal strength from MW.

One of ther nice features of this antenna is the fact that both secondary
( antenna side) and primary ( coaxial feed side) grounds are separately
available on 10-32 stainless studs at the matchbox. They come supplied from
us with the two grounds strapped together. This may or may not be the
optimum configuration for your location and noise sources- experimenting
with the grounding, as detailed in the manual may make a much bigger
difference in S/N than increasing the wire length.

GL,

Dale W4OP
for PAR Electronics, Inc.