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Re: [TenTec] question

To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] question
From: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 21 Dec 2007 19:39:34 -0600
List-post: <mailto:tentec@contesting.com>
Stuart's point is well taken.

I bring a 30 amp 230 volt 4 wire service to the ham shack or operating 
position, being L1, L2, Neutral and Ground.  The 230 volt service is for the 
various power amps, 3 at present, and I plug in the amp being used to the 
single 230 volt outlet.  The 115 volt legs, L1 & L2,  are then divided to a 
quad group of duplex outlets.  Thus they share the same neutral and same 3 
rd pin ground. The computer is on one side of the line, L1 as well as one of 
the 2 HF stations,  while the Tentec Omni VII radio power supply is on the 
other leg L2 along with some other stuff i.e. VHF / UHF station power 
supplies and etc.  Since they all share the same neutral and ground there 
are no ground loops or current differential issues.

I've found that proper planning and wiring are the key to success in clean 
power and lightning protection.

Bob, K4TAX

----- Original Message ----- 
From: "Stuart Rohre" <rohre@arlut.utexas.edu>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Friday, December 21, 2007 7:04 PM
Subject: Re: [TenTec] question

> Given Bob's constraints of having the computer on the same third pin 
> outlet ground as the rig, a transformerless interface can work.  However, 
> with the proliferation of accessories to computers and rigs, you find many 
> RFI problems caused by users' need to use more than one duplex outlet, and 
> those being on different legs of the power system.
> If there is a chance you will take your rig to locations for emergencies 
> for example, or demos, where you cannot verify the ground integrity, a 
> transformer interface to break ground loops or isolate varying grounds is 
> a cheap insurance policy.
> -Stuart
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