Finally got support from the local installer this week. He installed the 10VK6
filter between the plug in lightning arrester and the twisted pair going
underground. All noise coming from the buried electric fence has disappeared.
I checked all bands from the AM broadcast band and up. My 3-el vertical receive
antenna which is only about 10’ or so from the buried wire is now quiet.
I wanted the installer to do this so that the neighbor had no doubts about the
installation.
A special thanks to Don for helping with this.
Now I can focus on a dusk-to-dawn fixture that nails me on 1818, 1825 and 1828.
Weird that it is these three frequencies where it peaks. Got the direction it
peaks, so now do some snooping near darkness.
73,
N2TK, Tony
From: Don Kirk [mailto:wd8dsb@gmail.com]
Sent: Tuesday, February 09, 2016 5:38 PM
To: N2TK, Tony <tony.kaz@verizon.net>
Cc: RFI <rfi@contesting.com>
Subject: Re: [RFI] Invisible Fence ICT-801 interference
Below is an E-mail I just sent Tony (N2TK), and thought the information should
be shared with the entire group.
------------------------------------------------
Hi Tony,
I talked with the Duane who is in the engineering group at Radio Systems
Corporation, and had a very good conversation with him. Sounds like he had
gotten the spectrum plot from you that I sent you, and this confused him
because the frequency did not match up with the model you said you were working
with. He said the Pet Safe brand operates at 10.7 khz as well as 7 khz
(switchable). He said the Pet Safe brand has more of a sinewave output whereas
my Innotek model has a square wave output which produces much more harmonics.
Nevertheless he said for folks having interference problems they recommend the
installation of a Corcom filter model 10VK6. Just connect this up between the
output of the transmitter and the underground wire loop that connects to it.
Sounds like this will function similar to my home brew filter. I will buy one
myself and see how it compares to my filter.
Based on this information you can probably use any number of RFI/EMI
suppression filters available from Corcom, Delta Electronics, etc. I have a
couple of Delta Electronics models that I will test out as time permits.
I will also make a posting to your original post with this info.
Don (wd8dsb)
--------------------------------------------------------------------
PS. The Innotek brand which I have transmits at around 8.17 khz.
73,
Don (wd8dsb)
On Fri, Jan 29, 2016 at 6:32 AM, N2TK, Tony <tony.kaz@verizon.net
<mailto:tony.kaz@verizon.net> > wrote:
Don,
Great info. I will give them a call today. And if I run into a roadblock I will
contact you about the filter.
73,
N2TK, Tony
From: Don Kirk [mailto:wd8dsb@gmail.com <mailto:wd8dsb@gmail.com> ]
Sent: Thursday, January 28, 2016 3:50 PM
To: N2TK, Tony <tony.kaz@verizon.net <mailto:tony.kaz@verizon.net> >
Cc: RFI <rfi@contesting.com <mailto:rfi@contesting.com> >
Subject: Re: [RFI] Invisible Fence ICT-801 interference
Hi Tony,
I have a lot of experience with invisible fence transmitters, and I even
reverse engineered (decoded the 8 bit code my transmitter sends) and then
designed and built my own in case my purchased one ever dies. For my purchased
transmitter I had to make my own low pass filter using some radio shack snap on
RF choke Frames (part number 273-0104), and would be glad to sketch up my
filter if you can't resolve the problem another way. I installed my invisible
fence transmitter loop antenna wire above ground along the top of my vinyl
coated chain link fence, and it is not far from my 160 meter TX vertical or my
3 small receive pennants (30 feet or less). The problem I had was that my dog
was jumping over my fence, so I installed the transmitter loop wire at the very
top of my fence and turned the power way down so my dog would only gets a
correction if its collar gets within a foot of the top of the fence (this fixed
my problem while still allowing my dog full use of the yard). Having the loop
above ground is a worst case condition, so very pleased that I was able to rid
myself of the interference using the above mentioned choke. One of my next
door neighbors has the identical transmitter I have but it is underground and
about 10 feet from my property line and I have no problem with his system.
Also another next door neighbor has a different brand transmitter (probably
similar to your neighbors), and I don't have any problem from his system.
It looks like the transmitter you are talking about is made by a company called
Radio Systems Corporation, and they are a big player. The unit you have is
part of their Pet Safe brand. They also have another brand called Innotek
(which is the brand I have experience with).
Some models have a transmitter output power level control, but other models
have a fixed output level.
I suggest you call Pet Safe and discuss the problem with them on the phone and
see what kind of help they can provide (their on line technical support line is
very friendly). Their phone number is 1-866-738-4379 <tel:1-866-738-4379> .
It sure would be nice if they sold a filter, but this is something I have never
discussed with them. If you hit a dead end let me know and I will sketch up my
filter design for you.
73,
Don (wd8dsb)
On Thu, Jan 28, 2016 at 2:28 PM, N2TK, Tony <tony.kaz@verizon.net
<mailto:tony.kaz@verizon.net> > wrote:
Next door neighbor installed an ICT-801 Invisible Dog Fence.
It is supposed to run at 7KHZ. But it is sure strong on 160M and to a lesser
degree on 80M. The buried wire is about 10' from my inline verticals for
receiving. But I can also hear it somewhat in a Pennant that is about 30'
away. I can hear it as hash (but not loud) up to 15M when pointed in that
direction.
Does anyone know if this is normal for these units to put out so much noise?
Does ferrite on the wires from the unit to the buried wires and the battery
backup unit help at all? Before I ask the neighbor if it is okay to try some
ferrite snap on cores I wanted to ask here if anyone has had success
cleaning up this thing.
73,
N2TK, Tony
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