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Re: [RFI] Electric Fence pulsing (will get worse soon !)

To: RfI@contesting.com
Subject: Re: [RFI] Electric Fence pulsing (will get worse soon !)
From: donovanf@starpower.net
Date: Wed, 22 Jul 2015 13:59:42 -0400 (EDT)
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Hi Mike, 

A time domain reflectometer makes quick work of identifying the locations of 
faults in an electric fence. Maybe you can find a ham who will loan one to you. 
Properly installed its resistance to ground should be many thousands of ohms. 


----- Original Message -----

From: ve9aa@nbnet.nb.ca 
To: kgordon2006@frontier.com 
Cc: RfI@contesting.com 
Sent: Wednesday, July 22, 2015 5:41:40 PM 
Subject: Re: [RFI] Electric Fence pulsing (will get worse soon !) 

Hi Ken, 

I am taking this step by step and yes, the owner is working with me, but I have 
to first convince him I know what I am talking about. WE've never encountered 
each other before, so we have no history. I want it to be a good one. I told 
him about my concern about him losing his horses. I said I help you, you help 
me. He seemed to like that. 

I am a ham, ex apprentice electrician and current EE TEchnologist so at least 
have some idea what I am talking about ;-) 

Electric fences are new to me, but Electricity is Electricity. 

It's slow going, but he's not resistant. Just very busy like most folks. Has a 
day job outside horses. 

Two weeks ago he redid a connection or two (more to go)-no real change. 

Last week he added another short ground rod and one large ground plate this 
last weekend. . (we cannot really drive a rod here more than 1-2 feet, max. 

This morning @ 7am I noticed it was off.....whatever that means. Could be he 
was redoing a connection before he hustled off to work. 
Since yesterday I now know his make and model so I have printed out a manual 
for him highlighting 7 or 8 times in there that says (essentially) "weeds are 
bad and it won't work touching the weeds" so I will drop that off tonight 
and/or tomorrow. 

I bought a fence tester and told him he could use it any time he wanted and/or 
I would help troubleshoot it. Not forcing me to do it for him. Getting him to 
ask ME to help him more or less. 

BTW, I was NOT able to even measure 300v is what I said. I touched it last 
night (with him as a witness) as the fence came around the last part of around 
1000' of wire-rope and barely felt a spark.....so maybe a couple hundred volts? 
(a wild guess) 

I'll get there. WIth your guys help and my work with him. 

The very worst thing I could do is go waving around my rights and rules and my 
ham license. Not sure who told me that, but that's not how we do things here in 
NB. I appreciate the advice, but I am months if not years from doing that. 
Strictly a last resort ! 

Mike VE9AA 
---- "Kenneth G. Gordon" <kgordon2006@frontier.com> wrote: 
> On 21 Jul 2015 at 19:07, Mike Smith VE9AA wrote: 
> > Large red box built by PARMAX. SOLAR PAK 6 Model DF-SP-L1 (Kansas City) 
> OK. I just checked the manufacturer's site. The specified voltages are: 
> 11.5 KV when the entire fence is "open circuit" and 2650 Volts at 500 ohms. 
> From your report, you measured something like 300 volts at one point, and 
> even less at another. 
> 300 Volts, if that is an accurate measurement, indicates an impedance of 
> less than 60 ohms. (2650/500=300/X) 
> There is DEFINITELY some sort of short-circuit somewhere in that fence 
> system. 
> I REALLY think that even you could "feel" a 2600 volt pulse!!!! I know I sure 
> could!!!! 
> Also, the unit is specified for use in small to medium pastures, whatever 
> that 
> means. 
> There is most certainly something wrong with the installation. My suggestion 
> to disconnect, completely, the bottom strand of the system, then to re-check 
> its performance with only the top, completely clear (supposedly) strand would 
> at least make the issue more clear. 
> Someone else here with far more experience than I with farms and electric 
> fences also said that in his opinion there was definitely a problem with the 
> installation. 
> Have you yet compiled the info we have tried to share with you and 
> presented it to the other fellow? 
> Have you taken this man to the point in his fence system where YOU felt 
> almost nothing and had him "test" it himself? 
> If you cannot convince him of 1) your competence in such matters, and 2) 
> that there IS a problem with his installation, and 3) that it is MOST LIKELY 
> his installation that is causing severe interference to your federally 
> licensed 
> radio station, then maybe you had better consider calling in some "bigger 
> guns" if such exist in your area. 
> To my way of thinking, this has gone far enough. 
> Ken W7EKB 

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