On Sun,5/21/2017 11:50 AM, Catherine James wrote:
The next cheapest 10 db is installing a tribander at 70 ft or higher.
I don't know of any tri-banders that will give you more than about 7 dB
over a dipole (dBd), and most are in the range of 3-5 dBd. Stack a pair
and pick up another 3 dB, as well as diversity of vertical pattern.
From an engineering point of view, Cathy's points are right on target.
EVERY system is different -- engineering is the art and science of
compromise tailored to the system in question. As she notes, nearly all
hams are limited in what antennas we can put up, by our RX noise
environment, and by our budget. A compromise that's great for one of us
may be less than ideal (or even quite poor) for the next guy.
I'm lucky to have a lot of real estate and a lot of redwoods, and to
have moderate RX noise on most bands most of the time. The trees are
free, but the tree climbers are not. :) High band antennas are Yagis at
120 ft and 40 ft. My low band antennas are wires as high as I can get
them (about 140 ft) in those trees, and I've got four RX antennas. I've
also got a pair of 87As (bought used) and a KPA500 (for 600W on 6M and
instant-on). And I've spent a LOT of time minimizing my own
contributions to RX noise -- there are no SMPS in my home/shack. I'm
pushing the envelope from both directions -- legal limit power and
optimizing both TX and RX antennas.
And as another kind of challenge, I also run QRP in DX contests. 160
countries QRP, 319 at legal limit.
I have no respect for hams running illegal power -- I view it as
cheating, just like Lance Armstrong and Barry Bonds.
73, Jim K9YC
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