I have used the Fido Shock fence for keeping dogs in. They used to be
available at Home Depot but not sure if they still are. It was a
continuous and not pulsed fencer so there was never any noise from the
charger waveform. Essentially a current limited transformer with about
750-800 VAC output.
I have also used the small Zareba charger from Tractor Supply. It is a
pulsed charger and I have never heard any ticking from that it even
though the dog fence is located only 20 feet from a 40M Inverted Vee
leg.
While I am sure there are some chargers that have pulsed waveforms that
are conducive to excessive harmonics, most of the fence noise I have
worked on was due to arcing somewhere along the fence. The worst was
when my neighbors fence broke and was laying on the ground. I could
visually see it arcing in at least 3 places and hear the crack of the
arc from my deck 100' away. It was taking out my VHF rabbit ear TV
reception too.
Earl N8SS
------------------------------
Message: 4
Date: Mon, 05 Jan 2009 18:33:14 -0500
From: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Subject: [RFI] Electric fencer, or charged capacitor (Squirrels)
Cc: RFI@contesting.com
Message-ID: <496298BA.8080804@rogerhalstead.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I have a problem with Squirrels and need to discourage them without
killing, damaging, or hurting them badly.
I've though of an electric fencer, but that's a bit pricy for just
discouraging squirrels. I could also charge a cap from a small, low
current, HV supply and use adhesive backed copper foil around the edges
of the feeders. This will work, but I'm not sure what size cap to use
and the supply would need to be simple and RF quiet.
I know this works as "in the old days" it was not uncommon for some one
to holler, "catch" and too late you'd realize they'd just tossed you a
fully charged cap with the "bare" leads taped down the sides. 450@40 or
50 mikes, *hurt*! The "old timers" would just step out of the way and
watch it go by while the newbies ...er new comers would catch them, at
least once or twice.
My goal is to discourage them without wiping out any of the bands from
broadcast through upper TV AND not have my wife have her sense of humor
ruined by it when she fills the bird feeders. We've been fairly
successful with variations of height, spacing, mounts...etc...etc... But
the more successful we are the more destructive the little buggers
become. So far they've left the coax cables alone.
I've suggested squirrel stew...<:-)) but they are "out of season" AND
more importantly we live in a subdivision, AND even more importantly, my
wife says NO!<:-))
Any suggestions?
73
Roger (K8RI)
------------------------------
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End of RFI Digest, Vol 73, Issue 7
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