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> 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]
> *Sent:* Thursday, January 28, 2016 3:50 PM
> *To:* N2TK, Tony <tony.kaz@verizon.net>
> *Cc:* RFI <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. 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> 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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>
>
>
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