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Author Topic: Invisible Fence  (Read 12936 times)
W9IQ
Member

Posts: 538




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« Reply #15 on: July 17, 2016, 05:42:52 AM »

Chris,

If you would also like to try a low pass filter between the output of your transmitter and the buried wire, here is a simple 100 kHz low pass filter that should do the job:



It only takes 0.022 uF capacitors (qty 5) and 1.2 mH inductors (qty 2) so it should be under $10 if you are buying everything new. The resistors shown are not part of the filter - they represent the source and load impedance. The 0.066 uF capacitor is three 0.022 uF capacitors in parallel. The 1.2 mH chokes can be something like this:

http://www.digikey.com/product-detail/en/abracon-llc/AIAP-03-122K/AIAP-03-122K-ND/3059934

You can build it on perfboard or dead bug style on a piece of PCB. Mount it as close as you can to the transmitter and inside the Faraday cage if you go that route.

- Glenn W9IQ
« Last Edit: July 17, 2016, 06:53:32 AM by W9IQ » Logged

- Glenn W9IQ

I never make a mistake. I thought I did once but I was wrong.
KB3LMC
Member

Posts: 39




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« Reply #16 on: Today at 01:08:10 PM »

SOLVED.

Installed a Corcom 10VK6 (found solution on another post on the forum) between the transmitter and the fence loop.  Seems to work well and has removed the RFI I was experiencing. 

Send me a message if you would like a picture of my install.

Chris
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W9IQ
Member

Posts: 538




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« Reply #17 on: Today at 02:06:19 PM »

Chris,

That is great news. I am glad you found an off the shelf LPF that worked. Congratulations! I will add your solution to my playbook.
Logged

- Glenn W9IQ

I never make a mistake. I thought I did once but I was wrong.
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