Still working out how to put up my 88ft doublet. One option puts the
midspan support a bit off the natural fall line. The result is that in
addition to the modest double catenary droops made possible by midspan
support it would also bend by perhaps 1 to 2ft off the normal gravity
plane right at the midspan support.

This would allow me to put it deeper into the woods and away from
neighbors' eyes.

Is this a big problem?

tnx
jtm

On 7 Mar 2005 08:47:44 -0800, "Jim Miller" wrote:

Still working out how to put up my 88ft doublet. One option puts the
midspan support a bit off the natural fall line. The result is that in
addition to the modest double catenary droops made possible by midspan
support it would also bend by perhaps 1 to 2ft off the normal gravity
plane right at the midspan support.

This would allow me to put it deeper into the woods and away from
neighbors' eyes.

Is this a big problem?

No, it's not even a little problem.

The only problem might be that burying 1 leg only into the woods may impact
matching at higher frequencies - the doublet may become less "balanced" due
to proximity to moist vegetation, especially during the summer and rainy
times. I have found that lower frequencies are less impacted by trees, etc.

As far as bending the doublet, as long as any bend isn't more than about 90
degress (as a rule of thumb), it should work just fine - try to keep both
legs more-or-less symetrical. Most of the radiation is from near the
feed-point so the longer the wires before bending or drooping the better.
Just some thoughts from my past experiences and previously published
comments I have read before.

Good luck........ al, va3kai



"Jim Miller" wrote in message
ups.com...

Still working out how to put up my 88ft doublet. One option puts the
midspan support a bit off the natural fall line. The result is that in
addition to the modest double catenary droops made possible by midspan
support it would also bend by perhaps 1 to 2ft off the normal gravity
plane right at the midspan support.

This would allow me to put it deeper into the woods and away from
neighbors' eyes.

Is this a big problem?

tnx
jtm

Both halves of the doublet will be rather equally hidden in the woods.
The bend would result in the halves of the doublet departing from
nominal collinearity by about 5=B0. The droop on either side of the
feedpoint would be the same as any other center supported doublet. The
center support is there to relieve the doublet of the need to support
the weight of the feedline.

tnx
jtm

Jim Miller wrote:
Both halves of the doublet will be rather equally hidden in the woods.
The bend would result in the halves of the doublet departing from
nominal collinearity by about 5°. The droop on either side of the
feedpoint would be the same as any other center supported doublet. The
center support is there to relieve the doublet of the need to support
the weight of the feedline.

A 75% drop in radiated signal is approximately one S-unit.
How many S-units difference do you think a 5° difference
will make?
--
73, Cecil http://www.qsl.net/w5dxp

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