[RFI] 80/160M RFI in neighbor's oven circuitry (PART 2)
wa3gin at comcast.net
Sun Feb 8 15:16:23 EST 2009
The GE Profile microwave here is 240volt @ 30amps per leg. No GFI at that
Depending on the code and age of the house it may not have any external
ground rods installed. For example, here in Alexandria,VA a home built in
the 30s would not have external ground rods. They just ran a wire to the
cold water pipel that ran into the house.
Having run 160, 80, and 40m antennas parallel to the power line drops
perhaps 30ft in distance I can certify that adding a couple of ground rods
does in fact act like a sink to pour RF. Every location is different. At
my house with running a KW on 40m I could pull an arch off the phone line
with a carbon pencil. Seven K-COM filters reduced the RF but didn't
eliminate it. One Corcom EMI/RFI filter completely removed the RFI from the
phone line. But I had to connect the case of the Corcom filter to those
useless ground rods ;-) or it didn't work worth a damn!
Radio is an art for amateurs radio operators. Sometimes EEs can get a
headache trying to figure out why things don't work the way the text book
says it should -- must be the magic of radio ;-)
----- Original Message -----
From: "Roger (K8RI)" <k8ri at rogerhalstead.com>
Cc: <rfi at contesting.com>
Sent: Sunday, February 08, 2009 2:15 PM
Subject: Re: [RFI] 80/160M RFI in neighbor's oven circuitry (PART 2)
> RFI Services' Mike Martin wrote:
>> I think the ground socket is now required to be installed on top so if a
>> conductive cover plate were to come loose it will fall onto the ground
>> terminal instead of shorting the hot leg to the neutral.
> That was the old reasoning. In industry they called it a fire hazard
> among other reasons so that was banned. With GFIs it makes no
> difference what shorts. Again it depends on where you live and who wrote
> the code and their rationalization behind it.
> Roger (K8RI).
>> Sometimes this creates issues with the way a heavy duty cord is molded
>> are too short to work.
>> Best Wishes,
>> Mike Martin
>> RFI Services
>> 6469 Old Solomons Island Rd
>> Tracys Landing, Md 20779
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