On 3/30/2026 6:30 PM, Doug Renwick via TowerTalk wrote:
Nothing scientific
That's exactly why you don't notice differences -- band conditions
easily obscure the differences. The difference in gain, averaged over
each band, between the large Moseley and Force 12 tribanders was 5-6 dB.
6 dB is an S-unit, corresponding to 4X the transmitter power.
BTW -- it is not "bashing" to do well controlled measurements and
publish the result.
The report on these tests is "HF Tribander Performance, Test Methods &
Results, 2nd Edition" by Ward Silver, N0AX and Steve Morris, K7LXC." It
was published in 1999 by Champion Radio Products. There's also a report
on a later test of HF multiband verticals. Each costs $20. Ward retired
from ARRL a few years ago, where he was responsible for updates to The
Handbook, The Antenna Book, and authoring other books, including the
ARRL Book on "Grounding and Bonding." I worked with him for about 15
years on all three books. Ward is a VERY smart engineer.
https://championradio.com/product-category/publications/
N6BT has published several editions of his very useful book about
antennas and their design called "Array Of Light." I have either the 2nd
or 3rd edition (currently loaned out to a new ham, so can't look at it).
It is written for those who are not engineers, but this engineer learned
a lot from it.
The current edition is the 4th, and a description on his website says
it's focused on HF verticals, which is has been his small company's
focus for a decade or so. For the discussion of HF Yagis, you want the
earlier edition.
This is the newer book. https://n6bt.com/on-line-check-out-cart
73, Jim K9YC
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|