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Old May 7th 07, 11:52 PM posted to rec.radio.amateur.antenna
Jim Lux Jim Lux is offline
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First recorded activity by RadioBanter: Mar 2007
Posts: 801
Default H F Antenna - BWD-90 VS G5RV

Bob D. wrote:
I'm still trying to decide on a ready-made HF antenna. I have a couple more
questions.

Can the Barker & Williamson's BWD-90 really be used without an antenna
tuner?

Does the G5RV really need an antenna tuner?

Wow, there's a 7:1 price difference here! Hope to be QSOing soon, instead
of emailing.

The B&W (and all of the essentially identical antennas which are a
folded dipole of some sort with a big resistor) are an interesting
solution to a system engineering problem. Sure, they're hideously
inefficient, but, they don't require a tuner, and if you're not power
limited, you can overcome the inefficiency by just turning up the amp.

It's no different than putting a 3dB pads on the ports of a mixer to
make them less sensitive to the match. You take a efficiency hit, but
you pick up overall system insensitivity to component variations, etc.


A terminated folded dipole and a broadband solid state amp is not a bad
system solution for someone who needs a broadband (2-30MHz) system that
is simple to deploy and has essentially instantaneous frequency change
ability. Hmmm.. folks with ALE or HF frequency hopping radios in a
tactical environment. And who buys these sorts of things: military and
diplomatic folks, who aren't power constrained, need fast frequency
changes and simple installation, and aren't concerned about saving every
penny. In that market, a few hundred dollars more or less makes almost
no difference.

Jim, W6RMK