I built a "Phase Box" with sections 2, 4, and 8 feet long. It can be used
to vary the "phase" between two antennas - e.g. vertical arrays or stacked
arrays, and also as a "Line Flattener" when using an antenna outside it's
acceptable SWR limits. A handy box but takes a lot of relays. When using it
to change the phasing on a stack, especially in the presence of typical HF
QSB, it's hard to notice much, if any, difference until you get to a
significant phase change i.e. at least 50-60 degrees. 180 degrees out and
you really see it! Stacking an LP with a tribander is interesting since the
effective feed point in the LP moves up and down the boom as you change
bands. The Line Flattener function is useful when using a solid state
amplifier which requires a pretty well matched load in order to get full
output.
Gene / W2LU
----- Original Message -----
From: "Dan Hearn" <n5ardxcc@gmail.com>
To: "Jim Lux" <jimlux@earthlink.net>
Cc: "towertalk reflector" <towertalk@contesting.com>
Sent: Monday, March 18, 2013 12:17 PM
Subject: Re: [TowerTalk] Variable phasing was: Re: [CQ-Contest] Stacking on
separate towers, take off angles?
Artical in the Antenna Compendium Vol. 2 written by W5AH who worked for
the
company that sold them. He is a regular on TT. It switched in various
lengths of feed line plus a RF transformer to get 180 degrees.
Dan, N5AR
On Mon, Mar 18, 2013 at 7:50 AM, Jim Lux <jimlux@earthlink.net> wrote:
On 3/18/13 6:32 AM, Roger D Johnson wrote:
Here's the patent:
http://www.google.com/patents?**id=_WU6AAAAEBAJ&printsec=**
abstract&zoom=4&client=**internal-uds#v=onepage&q&f=**false<http://www.google.com/patents?id=_WU6AAAAEBAJ&printsec=abstract&zoom=4&client=internal-uds#v=onepage&q&f=false>
Interesting..
The antenna compendium article had a continously variable shifter
(actually, a regular old T or Pi tuner, as I recall)
There's countless ways to skin this particular cat.
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Dan Hearn
N5AR
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