Older aquarium heaters and even older electric blankets have similar
failure, or sometimes normal, operating characteristics. Oil furnace
igniters can also do something similar.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of dalej
Sent: Monday, January 12, 2015 14:47
To: RFI@contesting.com
Subject: [RFI] Heated dog water dish
Just want to relate a noise problem that I've had for a few winters. Always
in cold weather would this intermittent arc welder noise happen, especially
bad on 20 meters. Well, I finally had a chance to question a suspect
neighbor across the street who has a couple of dogs about outside water
dishes which have a heater. Sure enough, he had one behind the house out of
sight and it was plugged in. He was very cooperative in letting me walk
though the house to look at this dish. We unplugged it and I went back to
the shack to listen for the noise, it was gone. Mind you, when this thing
was sparking it was S-9+ and wiped out 20 m for 5 or so seconds every
minute, more often as the weather got colder. Anyway once unplugged the
noise was gone. I said I'll buy you a new water dish if I can have the old
one, he agreed, I did and it's now in use and the band is quiet again. I
have the dish in my possession and will take a couple pictures of it perhaps
contact ARRL with the inf ormation. These water dishes when in failure
mode are like arc welders, yes, that bad. How long it would have continued
to work is unknown, it might last for years or stick closed or open the next
day. It's been a problem for the past few winters and to work around it I
had a noise canx box, which helped plus If the antenna was pointed away from
that direction it was less noise.
Anyway for what it's worth the brand is K & H Thermal Bowl. I have pictures
if anyone is interested. The bowl I purchased is the same brand and model.
We shall see how long it lasts.
Long story, sorry.
73
Dale, K9VUJ
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