[TowerTalk] N8TR shunt feed followup question

[Pete Michaelis - N8TR]

At 05:28 PM 11/28/00 -0500, TheMardster@cs.com wrote:

>Pete, pardon my confusion. Are you saying that your bottom 'XA is fixed or
>rotatable? If it rotates, how does the shunt feed not interfere with the
>rotation?
>
>Marty Ray, N9SE


I have received several emails with the same question so I will respond
here in case I have confused anyone else.

The shunt feed cage  does limit how far I can rotate the XA mounted
on the swingarm.  Normally the XA on a swing arm could cover almost 300
degrees but because of the shunt feed cage I can only rotate it from about
30 to 165 degrees.  And to get even that much rotation I had to bend
the cage in to about one foot from the tower where the XA is located.
The cage is actually quite small consisting of a square of 4 wires about
3 inches on a side.  For most of its length it is about 27 inches from
the tower.  I was concerned that bending in the cage would severely
effect either the tuning or the performance (the bottom XA was added after
the tower was shunt fed) but only a slight change was required to the
shunt capacitor and performance seemed unchanged.

73 Pete - N8TR



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