[TowerTalk] Braided Ground Strapping
K7GCO@aol.com
K7GCO@aol.com
Tue, 19 Jun 2001 00:13:34 EDT
Very good point below. I didn't mention I used 2 brass screws also which
also soldered nicely. I also suggsted one continuous 6" wide strip all the
way across the desk and out to the bottom of the ground hole. k7gco
In a message dated 6/18/01 8:13:40 PM Pacific Daylight Time,
k4bet@bellsouth.net writes:
<< I would suggest one correction to a comment made and I quote: "It's easy
to
solder any other wires...."! Please, never solder any grounds! The low
melting point of solder will cause the joint to disintegrate extremely
rapidly with a very small surge of lightning. Then NO ground protection!
Use clamps and good strong compression fittings designed for the purpose!
----- Original Message -----
From: <K7GCO@aol.com>
To: <towertalk@contesting.com>; <w5kp@swbell.net>
Sent: Monday, June 18, 2001 11:00 PM
Subject: Re: [TowerTalk] Braided Ground Strapping
| In a message dated 6/18/01 6:33:17 PM Pacific Daylight Time,
w5kp@swbell.net
| writes:<<
| Copper roofing is all the rage for commercial buildings and some
high-end
| private residences, so my local scrap metal dealer always has a bunch of
| leftover pieces on hand from the commercial roofers, who sell him all
their
| copper roofing scraps. I buy it for $1 a pound, and 5 pounds is a lot of
| copper roofing, in pieces 6"-12" wide and 3 to 4 feet long. Cutting it
with
| tin snips works fine, but will leave an edge you could shave with, so
| getting it roller-cut into 1" strips or whatever at a sheetmetal shop
might
| be a good idea. I just clamped the strips between two pieces of wood in a
| vise and cleaned the dangerous edges up with a file. Took a few minutes,
but
| no big deal. That was one of the several times I wished I had a power
| nibbler. I saw a 100' roll of 2" at HamCom in Dallas, the guy wanted $150
| for it. Sheesh.
| 73, Jerry W5KP
| >>
| A local radio store here called Supertronics has copper sheet 6" wide on a
| roll fairly cheap. This would good to lay right on the radio table then
run
| outside--into the ground without any connections. Take a post hole digger
| and dig a hole say 6-8' deep. Run this foil into the hole and pack the
dirt
| in around it. You will have 6 sq ft of area in contact with the ground.
With
| a ground rod you have only about 1 sq ft. It's easy to solder any other
wires
| to it also and there is no change of inductance. This foil in the ground
| would be a great way to make a ground for a tower also.
|
| In the 30's it can be seen in old ARRL Antenna Handbooks where they used
| copper broilers they used for boiling cloths in for buried grounds. There
| was at least 15 sq ft of copper area--on both sides. That's what I call a
| "MAGNUM GROUND."
| I used to buy copper sheet 3' wide 35' long from Alaska Copper and Brass
here
| in Seattle also. I'd cut strips of copper that I coated with contact
cement
| and the element and wrapped it around the elements to eliminate joints and
| increase conductivity. I rotated it slowly in the lathe and wrapped it
with
| plastic tape. Shrink on tubing is too expensive. It's a "Higher Q
Permanent
| Element." It lowered the Z of the beam. Someday I'll "Silver Plate" the
| copper sheet and lower the RF resistance even more. k7gco
|
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