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Re: [TowerTalk] Shack wiring

To: "Tower and HF antenna construction topics." <>
Subject: Re: [TowerTalk] Shack wiring
From: "Jim Brown" <>
Reply-to: "Tower and HF antenna construction topics." <>
Date: Sun, 21 Mar 2010 17:32:16 -0700
List-post: <">>
On Sun, 21 Mar 2010 15:42:54 -0400, Paul Christensen wrote:

>BTW, the material that Jim Brown (K9YC) referenced from SurgeX is excellent.

Thanks, Paul.

>In thinking the secondary suppressor problem through, I thought that only a 
>"single-mode" L-N bypass to neutral (rather than ground) would prevent a 
>ground potential rise between branch circuits. 

That's right. It's the MOV to ground that causes problems.  

>Those devices exist, but apparently, they still do not provide as high 
>degree of protection than the technology used by SurgeX.

That's the way I see it.  The SurgeX stuff is expensive. When I'm specifying 
sound systems, I put SurgeX boxes on the gear that is relatively expensive 
and more likely to have issues with power line spikes. A 20A SurgeX unit that 
costs about $500 can protect $100K worth of DSP gear, mixing equipment, EFX 
boxes, etc. In terms of cost effectiveness and risk, that's a pretty good 
ratio.l But I am less likely to specify them to protect power amps, where I 
typically must put only 2-4 power amps on one SurgeX unit (because the 
current draw of power amps often requires a circuit for every 2-4 power amps) 
with a cost of only a few $K.  


Jim K9YC


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