Trent,
Your first problem is that your box is NOT a shield if cables come
through openings in the box without their shield being bonded to the box
at the point where they enter. You must also bond or bypass (with
feedthrough caps) all other leads coming into the enclosure, like power,
control lines, audio lines, keying lines, etc. Any one of these lines
that does not have its shield bonded to the enclosure or come through
the enclosure via a feedthrough capacitor destroys the shielding.
As to where to put the Polyphasers -- I would use the "feed through"
type and bond them to the enclosure.
The larger question is why you need a Faraday cage in the first place.
Few stations do. What most stations need is proper BONDING, proper
grounding, proper power, and proper interconnections between equipment.
Study http://k9yc.com/GroundingAndAudio.pdf
73, Jim K9YC
For On Sat,8/27/2016 10:28 PM, trentkd5ia--- via TowerTalk wrote:
My remote station is approaching completion. A 70' tower, wireless internet,
solar power and RemoteRig with a TS480 is all operational. Still in progress
are the antennas to be mounted, and lightning protection. I have a question
about grounding. The electronics are housed in a valve box--a galvanized steel
cylinder 5 feet in diameter and 4 feet tall, with 3 1/2 feet of that in the
ground. A removable steel lid covers it. All cables are in PVC pipe and enter
the housing under ground level, and the valve box is 12 feet from the base of
the tower.
The grounding system will consist of 9 ground rods, 3 connected to each leg of
the tower and extending out from the tower. The valve box will also be
connected to the grounding system. Polyphasers will protect against surges.
My question is, can I install the surge protectors inside the steel housing, or
should they be mounted outside the valve box? I'm thinking that the steel
cylinder possibly acts as a Faraday cage, and the grounding connection and
surge protection should be attached on the outside wall of the housing. Any
comments or suggestions, please?
Thanks!
Trent K5XM on the windy and lightning prone West Texas plains
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