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Author Topic: invisible dog fence rfi on hf solution  (Read 13370 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
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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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N4VG
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Posts: 3




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« Reply #3 on: September 09, 2014, 01:35:19 PM »

I talked to the invisible fence people today and they were very helpful in trying to locate the problem . I have an S7 noise level on 75 meters. I will keep all posted . Thanks for the info on the toroids on a previous post.  Mike N4VG
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SIGINT11
Member

Posts: 21




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« Reply #4 on: September 13, 2014, 11:20:42 AM »

I had a similar interference issue with one of these about 8 years ago,  It was made by a company called "Innotek"  .  I was unable to find solution due to the owner being uncooperative as well as the mfg.   Innotek claimed they never heard of this yet their manual clearly states part 15 and tells owner to turn off if interference is reported.      I had to go the FCC way and after their second letter advising them to turn it off they put a for sale sign up and the problem moved away.
 My process went something like this,  DOCUMENTED everything as I didn't know where this would head.
 A. confirmed source with assistance from JCPL
1.  talked to neighbor about issue.   he said he would look into it.     3 months later
2.  talked to company in town who installed it.  advise them of problem.  got attitude.
3.  talked to neighbor again, also purchased the recommended Corcom filter for him.    no help,  attitude
4.  offered to purchase new model for them that did not interfere.     did not accept.   
5.  with assistance from Mike Gruber at ARRL we filed a complaint with FCC   
6.  A-holes moved away,   problem is it took almost 2 years

I guess if its your own fence its easy to remedy it.   congratulations on fixing it.    did you happen to let the mfg. know your solution. 
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W1IT
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Posts: 174




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« Reply #5 on: October 23, 2014, 01:11:19 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.
kg4jjs

 I was off air for a while and recently came back to S9 static type interference on 75. Its horrible. I have a jerk neighbor who own a kennel and has had his dogs yack at other dogs coming near. He used to go out and fire off a gun, but recently he is away. I checked this noise with a wrist am radio and its right within an acre or two and very persistent. night and day. What does the dog fence sound like. What I have sounds much like insulator power line, but our power lines are under ground. So, I have not proven its from him, but he would never cooperate with me even if it was so.. what does it sound like? Send me an MP3?
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SIGINT11
Member

Posts: 21




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« Reply #6 on: October 27, 2014, 03:17:22 AM »

The noise I was affected with had a very distinct pulsing noise 24/7, this was from an Innotek model fence.   ARRL used to have page that had a catalog of noises but I have not been able to find it lately.    If you go scan around the 4/5 MHz range and locate one of those CODAR radar's it was very similar to that interference.
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