Is there a convenient sousrce for copper strap or copper plate?
Home Depot has the copper tubing I reckon.
Thanks,
Rusty, na5tr
----- Original Message -----
From: "Gary Schafer" <garyschafer@comcast.net>
To: "'jeremy-ca'" <km1h@jeremy.mv.com>; <wc1m@msn.com>;
<towertalk@contesting.com>
Sent: Thursday, August 16, 2007 9:00 PM
Subject: Re: [TowerTalk] Ground System
> Copper strap is cheaper than tubing for a given amount of surface area
> verses tubing. If I had a choice of where to run that extra copper I would
> run it in another direction from the tower and some from the single point
> ground entrance panel, rather than in the same trench with the cables.
> Make
> radials.
>
> 73
> Gary K4FMX
>
>> -----Original Message-----
>> From: towertalk-bounces@contesting.com [mailto:towertalk-
>> bounces@contesting.com] On Behalf Of jeremy-ca
>> Sent: Thursday, August 16, 2007 8:45 PM
>> To: Gary Schafer; wc1m@msn.com; towertalk@contesting.com
>> Subject: Re: [TowerTalk] Ground System
>>
>> Would it help to run 1/4" copper tubing (as used for refrigerator ice
>> makers) in the trench? Then bond that to several ground rods and also
>> tape
>> the coax to that tubing.
>>
>> Carl
>> KM1H
>>
>>
>>
>> ----- Original Message -----
>> From: "Gary Schafer" <garyschafer@comcast.net>
>> To: <wc1m@msn.com>; <towertalk@contesting.com>
>> Sent: Thursday, August 16, 2007 9:38 PM
>> Subject: Re: [TowerTalk] Ground System
>>
>>
>> >
>> >
>> >> -----Original Message-----
>> >> From: towertalk-bounces@contesting.com [mailto:towertalk-
>> >> bounces@contesting.com] On Behalf Of Dick Green WC1M
>> >> Sent: Monday, August 13, 2007 10:32 PM
>> >> To: 'K4SAV'; towertalk@contesting.com
>> >> Subject: Re: [TowerTalk] Ground System
>> >>
>> >> > Coax shields won't take very much current before they melt. A large
>> >> ground
>> >> > wire will lower the impedance between the tower and the common point
>> >> > ground, as well as reduce the voltage drop for these low frequency
>> >> > components.
>> >>
>> >> RG-8 style coax shields won't take much current before they melt, but
>> as
>> >> I
>> >> mentioned, I have two runs of 1-5/8" heliax running between the tower
>> and
>> >> shack, connected to the tower ground system at one end and the SPG at
>> the
>> >> other end. For those not familiar with this type of cable, the outer
>> >> conductor of each run is nearly 2" in diameter -- basically a big,
>> >> flexible
>> >> copper pipe with a lot of surface area. I don't have a spec on the
>> >> thickness
>> >> of the copper, but it's probably on the order of 1/64". The resistance
>> >> per
>> >> foot is .14 ohm/1000 feet. I don't know the current handling capacity,
>> >> but
>> >> the power rating is 310 KW. Although the heliax is jacketed, and
>> >> therefore
>> >> won't conduct a surge to ground like a bare wire in the trench, it
>> seems
>> >> to
>> >> me that the two large copper tubes present a much more inviting path
>> >> to
>> >> the
>> >> SPG than the bare wire. True or false?
>> >>
>> >> 73, Dick WC1M
>> >>
>> >
>> > There will be a great amount of capacitive coupling to ground provided
>> by
>> > those long cables even being insulated. A great deal of lightning
>> > energy
>> > is
>> > connected to earth by capacitance in any ground system. Yes a DC (bare
>> > wire)
>> > connection would be better and help more with the low frequency energy
>> > coupling.
>> >
>> > 73
>> > Gary K4FMX
>> >
>> >
>> > _______________________________________________
>> >
>> >
>> >
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>> > TowerTalk@contesting.com
>> > http://lists.contesting.com/mailman/listinfo/towertalk
>> >
>>
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