Topband: VO1HP FCP Inv L and Kitchen Oven

VO1HP fdavis at nfld.net
Thu Aug 30 09:00:24 EDT 2012


The Inv L FCP continues to perform.

After a nice long hot summer here which is unusal here I was on last 
night around 0230 and worked K6ND, WJ3A, G4EIM. LY2OU, UY0ZG.

While operating I started hearing at regular intervals somewhere of in 
the distance "beep beep"   pause "beep beep" ...upon investigation I 
found the kitchen oven had turned itself on and was awaiting further 
instructions from the keypad.  I was running about 600w and the flat-top 
of  the L runs more or less over the kitchen area.

I reread the RFI article re kitchen ovens in May 2012 QST and my first 
reaction was to try and place by-pass caps as described in the artcile. 
Howevere I thought I would try the  simplest thing first. This morning I 
was able to place two snap on chokes of #43 material over the 240V wire 
inside the access panel at the back of the stove.  The 1/2inch hole in 
the cores is not big enough to snap over the cable as it enters the 
stove.  So I removed the plug from the wall and removed the access panel 
of the stove.  There was enough room in the area to accommodate two snap 
on chokes --  i ran two wires  through one core and one through 
another.  There was just enough space to accomodate the cores.

Upon testing at 600-700W the oven appears to be unaffected now. 
hopefully it remains thus.

The old inv L and on the ground non-uniform and erratic radial system 
did not cause this issue so do I conclude that the effective radiated 
field from the FCP Inv l is that much stronger?  Yesterday I also did 
some more work on the FCP ...when I initially built it I used 1/2inch 
pressure treated wooden spacers and tie wraps. Yesterday I replaced the 
those spacers with 1/2inch "PEX" (HDPE material) water  pipe painted 
black.  These spacers appeared to cause a slight shift in the SWR curve 
for the L...raising somewhat away from 1800khz.  I am wondering about 
this material and whether its the right stuff to use?

By the way the oven model Jenn-Air JES8850ACB ( same number for Maytag)

73 Frank VO1HP


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