[TowerTalk] Variable phasing was: Re: [CQ-Contest] Stacking on separate towers, take off angles?

[Gene Fuller]

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 at gmail.com>
To: "Jim Lux" <jimlux at earthlink.net>
Cc: "towertalk reflector" <towertalk at 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 at 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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