AMEN AMEN
Don
N8DE
Quoting NPAlex@aol.com:
>
> Mark,
>
> I would strongly recommend not locating the relay at the 80ft level on your
> tower unless you enjoy climbing, on a cold winter night, during a contest
> or other inopportune time. Because that is when the relay will fail.
> Locate it at ground level where it is easily accessible. Been
> their and done
> that
>
> Norm W4QN
> -------------------------------------------------------------------
>
> Message: 3
> Date: Tue, 17 Aug 2010 19:40:13 -0400
> From: "Mark Robinson" _markrob@mindspring.com_
> (mailto:markrob@mindspring.com)
>
> I am intending to fit this relay box at the 80 foot level on my tower
>
> _http://www.arraysolutions.com/Products/dualfeed.htm#top%20of%20page_
> (http://www.arraysolutions.com/Products/dualfeed.htm#top%20of%20page)
>
> I planned on using wire like this to feed 12V to the relay
>
> http://www.lowes.com/pd_314364-20424-55269-S4-08_4294821905_4294937087?produ
> ctId=3128549&pl=1¤tURL=/pl_Electrical%2BWire%2Band%2BCable_4294821905_
> 4294937087_?cm_cr=Electrical-_-Web%20Activity-_-Electrical_A1_Activity-_-SC_
> Electrical_Area1-_-19604_1
>
> since it was readily available and cheap. I know that I don't need wire
> this
> thick but it is cheap. I plan on using a cheap Radio Shack 12V psu in the
> shack. I don't want this cable tied into my expensive Astron 12V supply
> which could be damaged by lightning and then feed the pulse into any other
> equipment tied to the shack 12V DC bus.
>
> I am planning on protecting the 12V line with "MOV Metal Oxide Varistor
> 24Z50 Harris 100J" on each line to ground at the base of the tower and at
> my
> SPG box. Adding some inductance just before the entry to the house might
> help too. I started thinking about this and was figuring that it might
> help
> to ground the 12V return wire to the tower at the top and bottom of the
> tower and at the SPG box. I wouldn't need MOV's on that return line then.
> I
> am not sure if this will provide any benefit from lightning. Taking this
> thought a bit furrther, maybe I could run the power down the tower using
> some old coax. The center conductor would carry the 12V positive and the
> return would be on the shield which would be grounded at the top and
> bottom
> of the tower and at the SPG box. Will using coax in this way provide any
> benefit over the wire from Lowes
>
>
>
> thanks Mark N1UK
>
>
>
>
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