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.
73
Frank
W3LPL
----- 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
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|