[TowerTalk] New Tower Grounding Advice
Phil - KB9CRY
kb9cry at comcast.net
Sat Mar 20 08:59:21 EST 2004
Bill Austin wrote:
> I'm putting up a new 60ft self-supporting Trylon.
Nice tower, I've got a 72 ft. Trylon and love it.
> I'm wondering how much and what type of grounding needs to be done.
> Any advice and suggestions would be greatly appreciated.
Thoroughly read the technical articles on the Polyphaser and ICE
websites. They are THE experts. Don't scrimp; do it right!
> I bought three grounding kits with the tower, one for each leg. I
> plan to tie the three rods
Only three? Polyphaser recommends about 85 ft of ground radial length
per leg. Personally, I have four eight foot rods, spaced 16 ft apart,
on each of my legs. No need to tie the three rods together, your tower
will do the job of distributing the energy amongst the ground radials.
> together using some #4 solid copper.
Use Cadweld or equivalent. Clamps will need retightening at least twice
> I plan to tie the electrical grounds for each of the three buildings
> near the tower into this loop. Each building has it's own breaker box
> and ground rod, and all three connect back to the same distribution
Good and this is also tied to your SPG, single point ground rod, to
which all your lightning protectors and shack ground is also connected.
> I also have a lightning rod to go on top the tower,
Useless. Your mast and tower will do the job and it you do the proper
job of grounding everything, then lightning probably won't hit the tower
since your constantly bleeding away the static buildup to which the sky
energy wants to bond.
> and plan to run a separate copper wire down the tower to the grounding
> loop at the bottom.
Useless again, your tower is metallic and will conduct the energy.
Don't forget to bond the coax shields to the tower, at least at the
base, to shunt energy off of the shields to the tower grounding prior to
going to the shack.
> I've been reading the archives for some time now. I was looking at
> Roger Halstead's site (linked in a recent post) and all the work he
> did with his towers. I was just wondering what else I should plan on
> doing. We have the rebar in, and I hope to be pouring concrete next
> Thanks & 73,
> Bill - KD7ZAH
> See: http://www.mscomputer.com for "Self Supporting Towers",
> "Wireless Weather Stations", and lot's more. Call Toll Free,
> 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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