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Author Topic: invisible dog fence rfi on hf solution  (Read 10044 times)
KG4JJS
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Posts: 3




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« on: January 08, 2009, 03:01:53 PM »

I have a neighbor who has one of those invisible dog fences and it was creating an s9 noise level across 80 meters and up to 60 meters.
I tried the following solution and it got rid of the problem 100 percent.
The solution.....get two Radio Shack (Catalog #: 273-104)
torroids wind them with 22 gauge wire at least 20 times on each torroid I have 24 turns on each of mine,do this on each of the two torroids then place one each in series with the fence antenna at the transmitter.
My noise level went from s9 on 80 meters to nothing no noise from the dog fence.
The torroids from the Shack are good for hf from 1500 khz to 30 mhz...below 1mhz it rolls down to zero.Below 100 khz its zero attenuation which allows the dog fence transmitter to work as it normally does with no ill affects.
Most of these dog fences operate in the 7khz to 15khz region.
So if you know of or are a person having this problem this IS the fix.

Thought I would share the solution for those who are having a similar problem.
73
Tim
kg4jjs
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N4IJS
Member

Posts: 1




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« Reply #1 on: September 16, 2013, 10:01:36 AM »

Hi,

I recently had an Invisible Fence installed and was suddenly seeing the interference.  I implemented your solution and it worked perfectly!  The interference was gone, but the fence continued to work.


Thanks you!


73,

Robert - N4IJS
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W2WDX
Member

Posts: 188




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« Reply #2 on: September 22, 2013, 12:03:23 PM »

It's amazing how much of this incidental radiation crap is entering the US market. A simple coil is all that is needed as a low pass filter and these manufacturers refuse to adhere to FCC regulations.
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