On 8/16/2010 10:22 PM, Dr. Gerald N. Johnson wrote:
>
> Likely the loss in most tuners feeding the 43' vertical through a short
> coax is a lot more than 50% (3 dB) probably more like 90% (10 dB).
>
Yes, this comports with conclusions stated in
the much of the literature on the matter.
Oddly enough, this big stick vertical monopole has
proven itself a very quiet, solid RECEIVING antenna
for both ham and general SWL purposes. I am lucky
in that I do not suffer from excessive or increased
QRM-EMI-RFI type noise as is usually associated with
vertical antennas. Also, it seems to work quite
well on 80 meters (especially for AM mode) and
on 40 and 20 meters quite well, indeed.
My take, is that asking this to do fully service on ALL
the major HF bands is asking too much of it. I am
happy just getting a reasonable signal out on 160
and on bands higher than 20. It does a lot in a little
space and without a large footprint and without
a big visual impact. The wife has no objection and
I am sure an 80 foot tower, with a big yagi beam,
and several low band dipoles would be way less
accepted. Not the best antenna, but not an
altogether bad one, either. It certainly is cost-
effective.
> You do have to adjust that coax transformer's length depending on the
> velocity factor of the coax that depends on the insulation density if
> foamed.
Agreed.
THANK YOU FOR THE ADDITIONAL GLOSS IN ANSWER TO MY QUESTIONS.
================================ JHR =========================
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