Hi Bruce,
I have a simple switchable coaxial BOG running NE-SW. I have often
noticed that it is not bothered much by rain. In fact, I would consider
this a valid selling point of the BOG. Having said that, even on a
rainy day, the longer 2-wire beverage up about 5' still hears slightly
better
I have a simple switchable coaxial BOG running NE-SW. I have often
noticed that it is not bothered much by rain. In fact, I would consider
this a valid selling point of the BOG. Having said that, even on a
rainy day, the longer 2-wire beverage up about 5' still hears slightly
better (even with
Very fine Jim.
What kind of gain readings are you getting now?
Christman phasing is at 71 degrees? I was thinking 90 degree phasing.
Whats the reasoning for this?
--
Jim K9TF
All good topband ops know how to put up a beverage at night.
_
Topband Reflector
I have seen some thing like those military surplus mast sections. I
believe the ones I saw were made by Shakespear. I think this is the same
company that made those good trout fishing rods and reels like the one I
have.
Sounds like your gearing up for Field Day. If so where are you going to
Read and envy: http://shakespeare-military.com/masts.asp
They take Visa and Mastercard!
Tim N3QE
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Jim GM
Sent: Wednesday, June 12, 2013 1:19 PM
To: topband
Subject: Re: Topband: My Turn For a Brain Pick
Christman phasing is at 71 degrees? I was thinking 90 degree phasing.
Whats the reasoning for this?
Optimum phasing of two verticals 1/4 wave apart is never 90 degrees, unless
the user for some reason wants a single-point zero-angle null and less than
maximum gain. Optimum element current
On 6/12/2013 11:58 AM, Tom W8JI wrote:
Christman phasing is at 71 degrees? I was thinking 90 degree phasing.
Whats the reasoning for this?
Optimum phasing of two verticals 1/4 wave apart is never 90 degrees,
unless the user for some reason wants a single-point zero-angle null
and less than
I guess 90 degree phase shift might result in a cardioid pattern?
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Wednesday, June 12, 2013 2:58 PM
To: topband
Subject: Re: Topband: My Turn For a Brain Pick - Sanity Check
On 6/12/2013 10:18 AM, Jim GM wrote:
Sounds like your gearing up for Field Day. If so where are you going to
set up?
With the K6MI Chews Ridge Gang, about 50 miles E of Monterey, CA. We
do QRP battery.
73, Jim K9YC
All good topband ops know how to put up a beverage at night.
On 6/12/2013 10:10 AM, Jim GM wrote:
What kind of gain readings are you getting now?
We didn't measure gain, but we did measure F/B. Gain is rather
difficult to pin down. Even F/B is tricky -- there was at least 6dB of
QSB on the rear setup (with the 71 degree line traded to the other
Right. There's some discussion of this in the ON4UN book, where I found
the Christman matching. As published there, it's 84 degrees of 50 ohm line
in each element, plus 71 degrees of 50 ohm line in the element facing the
desired forward direction,change directions by switching the 71 degree
On 6/12/2013 3:34 PM, Tom W8JI wrote:
I can't think of a reason to pick 90 degrees as a target value, unless
it is a system designed to protect something on groundwave that
happens to be straight in line with the elements.
I agree. For me, the primary design objectives are maximizing forward
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