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KG6BAJ > NWSGRP 23.09.09 17:01l 34 Lines 1331 Bytes #999 (0) @ WW
BID : 11776_N1OES
Read: GUEST
Subj: Re: Aluminum as a ground system
Path: DB0FHN<DB0FOR<DB0MRW<DK0WUE<DB0RES<WA7V<KG6BAJ<KG6BAJ
Sent: 090922/2001Z @:KG6BAJ.#NCA.CA.USA.NOAM #:11776 [Grass Valley] InterGate $
** NEWSGROUP: rec.radio.amateur.antenna
** FROM : "christofire" <christofire@btinternet.com>
"Ed" <Huckleberry_REMOVE_@bigvalley.net> wrote in message
news:Xns9C8EA619A693BHuckleberrybigvalley@198.186.192.196...
>
> A new commercial radio hilltop vault is being installed in my area....
> and the contractor has installed the tower and vault ground ring with
> aluminum wire/cable, I have been advised. I do NOT know the gauge of
> the wire, but I am curious what your thoughts are on this issue. I have
> been involved the past 35 years of my career in a number of ground
> installations and every one of those used large copper cable... no
> aluminum anywhere. The last of these I saw was 6 or 7 years ago.
>
> QUESTION: Are aluminum ground systems becoming common? Are they
> reliable, even after absorbing some heavy strikes? Any other comments?
>
> Ed K7AAT on the Oregon Coast
Isn't aluminium in the presence of air naturally coated with a thin layer of
aluminium oxide which doesn't conduct? In which case aluminium might be
fine for lightning conductors but hopeless for RF. What will the tower
carry? ... if it's all VHF and upwards then there's probably no problem.
Chris
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