Electric garage door opener? Most have internal SMPS units.
Drop the main breaker for the house and see if the noise goes away or
decreases on your car radio. If so, it is something in your house.
Now the hunt begins. One step at a time, being one breaker at a time.
That will allow one to determine what circuit/room the issue is
originating.
Depending on the age of the house, the ground system may have
deteriorated and needs updating or replacement. A qualified
knowledgeable electrician can assist in this regard.
Our house is 50 years old and I found the AC mains ground just below the
meter base had been eaten away by electrolysis. I had a new ground rod
installed and new cable ran to the meter base and then into the breaker
panel. Several issues were resolved with regard to lights getting
bright and dim for no obvious reasons.
73
Bob, K4TAX
On 4/6/2020 11:49 AM, David Christ wrote:
That is exactly what appears to be happening. Heavy cable starts at service
panel, proceeds into floor slab of garage which I assume is acting as Ufer
ground. What appears to be the same cable emerges from the other side of the
slab and connects to the water system. I think that it is fair to assume that
that the cable emerging from the slab is also connected to the Ufer ground thus
bonding the water system to the service system ground. This is one of those
things that is difficult to unambiguously describe with words but so easily
described with a very simple drawing.
I have do doubts that the system was properly designed and safe. But we are
getting off the question that I had about RFI. On 3/4/2020 K9YC discussed
triplen harmonics in ground systems (I may not be stating it properly). The
question is then “Could triplen currents in the power ground system as
described be causing the interference I experience when entering my garage?”
or is there another explanation for the RFI?
I repeat the description
The AM radio in the car works fine in the driveway, but as soon as one starts
to enter the garage, reception is covered up by a loud growl of static. Radios
in a room adjacent to the garage and over the cable in the basement below also
have a problem while AM radios at the other end of the house are fine.
David K0LUM
On Apr 6, 2020, at 8:39 AM, Wes <[email protected]> wrote:
I believe that is the case. However, one point on the water piping should be
bonded to the service ground for safety reasons. Using the piping for
current-carrying purposes is a really bad idea. Keywords: Copper pipe, dirt,
concrete slab, jackhammer. Don't ask me how I know.
Wes N7WS
On 4/5/2020 10:51 PM, Clay Autery wrote:
NO "water pipe" should ever be used as a service ground... I thought the code
was changed to actually bar that practice entirely.
______________________
Clay Autery, KY5G
(318) 518-1389
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