I used to pop the GFIs in my old house. Large ferrite beads: type 77 I
think or type 73 (whichever the beads come in), 1/2 inch long about, just
fit over A/C wire, forget # but could look up again. They cured by problem.
No GFCI was ever installed again without them. The Palomar "RFI Kit" has
been great. Have my second kit and can now just replace in the kit the
stuff I use most.
Dan KI6X
-----Original Message-----
From: rfi-bounces@contesting.com [mailto:rfi-bounces@contesting.com] On
Behalf Of Jim Brown
Sent: Sunday, July 25, 2004 9:36 AM
To: RFI List
Subject: [RFI] GFI Outlets
Here's a new one (for me, at least). I've always been a medium power guy --
100 watt barefoot radios have been my standard for 49 years -- but I
recently
bought a Ten Tec Titan amp (legal limit out) to be ready for BPL. To check
it
out, I've been loading it into some wire dipoles that are roughly 20 ft
above my
house wiring.
A week ago, after I fired it up for the first time, a GFI in my upstairs
bath died
(tripped, won't reset). I replaced it, and the replacement (same make/model)
died the next time I used the amp, during the IOTA contest this weekend.
Operation was on 40 and 20 meters. Mains power wiring is all inside grounded
steel conduit. There are also short cables of equipment plugged into the
four
convenience outlets that are powered from that GFI. So you've got the RF on
these cables, and you have current induced on the conduit that can couple
onto
the power wiring by SCIN (shield-current-induced noise).
The problematic GFI's are a Leviton model 802-6599W, and were purchased
at least 10 years ago. The replacement was a spare that was left over from
the
original install. I took apart the first failed unit to find a pretty nice
looking circuit
board (PNE-5) with what looks like either a transistor or SCR, an 8-pin
Motorola chip with an OEM number, five diodes, and a handful of caps and
resistors. I looked for shorts/opens on the diodes and the transistor, and
found
none. There is discoloration of the circuit board around the only high power
resistor on the board. The color code looks like 1K, and I read 15K.
Is this a common problem with GFI's? Are there high spec units I can
replace it
with? It's in a bathroom, so I don't want to leave the outlets unprotected.
Jim Brown K9YC
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