At 10:41 AM 3/18/02 -0500, Chuck O'Neal wrote:
>Absolutely not true!!! If you take the aluminum required for
>monobanders, 3 or 4 or 5 elements each, for three bands
>10, 15, and 20M, and make one log out of it, you get the WARC
>bands, all of every amateur band without regard to phone
>or CW tuning, better F/B ratio across entire amateur bands,
>Better SWR performance , with only a compromise in gain
>of 1 to under 2 dB, depending upon the design..
But a 10-30 MHz or a 14-30 MHz log on any given band doesn't even approach
the performance of a good 3-element monoband yagi. Check out the M2 gain
and F/B claims on the Array Solutions web site -- even their 11-element
6-30 MHz LP on a 76-foot boom only claims a peak of about 9.7 dB gain
(their chart doesn't specify dBi or dBd), and average gain is closer to 7.5
dB. And those are the manufacturer's claims.
A fairer standard of comparison would be an antenna like the Force 12 XR-5,
compared to a 14-30 MHz LPDA.
73, Pete N4ZR
Check out the World HF
Contest Station Database at
www.pvrc.org
|