roof ground plane
 

G'day Group,

I have a new QTH with a steel roof (colorbond) and am thinking of
putting up an unobtrusive (10m) vertical. I was considering mounting a
quarter wave length of aluminum tube from the ridge cap, and use the
roof as a ground plane. The roof slopes off either side at a shallow
angle.

Anybody done this? Anybody see any problems?

thanks, Peter.

roof ground plane
 

carpe ventus wrote:
Anybody see any problems?

Are all the pieces of the roof electrically
bonded together?
--
73, Cecil http://www.w5dxp.com

roof ground plane
 

On Apr 2, 8:22 pm, Cecil Moore wrote:
carpe ventus wrote:
Anybody see any problems?

Are all the pieces of the roof electrically
bonded together?
--
73, Cecil http://www.w5dxp.com

Hi Cecil,

The sheets of roofing are secured together via tek screws that pass
through the overlapping sheets where they are fixed to the truss - so
probably??? Maybe??? No not really.

Consequences?

cheers, Peter.

roof ground plane
 

"carpe ventus" wrote in message
...
On Apr 2, 8:22 pm, Cecil Moore wrote:
carpe ventus wrote:
Anybody see any problems?

Are all the pieces of the roof electrically
bonded together?
--
73, Cecil http://www.w5dxp.com

Hi Cecil,

The sheets of roofing are secured together via tek screws that pass
through the overlapping sheets where they are fixed to the truss - so
probably??? Maybe??? No not really.

Consequences?

cheers, Peter.

That describes my aluminum roof.
Never had a problem.
Slope gives a ~50ohm impedance, as mentioned before.

73
H.
NQ5H

roof ground plane
 

carpe ventus wrote:
Consequences?

Strange happenings are possible. Unpredictable varying
current and radiation patterns, changing impedances,
harmonics generated at the ground plane, ... It may
be the best thing since sliced bread but it may not be.
--
73, Cecil http://www.w5dxp.com

roof ground plane
 

In article
,
carpe ventus wrote:

G'day Group,

I have a new QTH with a steel roof (colorbond) and am thinking of
putting up an unobtrusive (10m) vertical. I was considering mounting a
quarter wave length of aluminum tube from the ridge cap, and use the
roof as a ground plane. The roof slopes off either side at a shallow
angle.

Anybody done this? Anybody see any problems?

thanks, Peter.

In Alaska, we have a lot of Steel, and Galvanized Tin Roofs, and I have
built Antenna Systems using them as RF Grounds, all over the State.
If I have the time, I usually Strip the Ground Braid off a length
of RG-8 Coax and use that to tie the ridge cap and each individual
sheet together, and use that as the Tie point for the RF Ground. That
makes sure that you have electrical bonding for the whole Roof. It
has been my experience that these type systems work well for providing
RF Grounding for Marconi, and End-Feed Longwire Antenna Systems,
especially, considering that the actual Earth up here has very little
Mineralite, and therefor very poor conductivity.

--
Bruce in alaska
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