RadioBanter - View Single Post - Current in antenna loading coils controversy

November 2nd 03, 06:49 PM

oSaddam (Yuri Blanarovich) wrote in message ...
I once had an occasion where the bottom of a coil did get warm, while
the top did not. Yet my RF ammeters showed the same current on both
ends. What was going on?

What was he measuring, where was the coil?
W9UCW used 100 mA at the bottom, I doubt that this would "cook" the coil. You
see the pictures, they are good quality coils and he use two meters and
flippped the coil to eliminate possible error as described here.

OK, I found the other website and saw the pictures. But this leads me
back to my previous post, which no one has commented on yet. To me,
the upper meter is actually measuring a point above the coil. But it
hard to tell from the pix exactly where the coupler is mounted. The
main question I would like answered is, would the presence of the
capacitive whip above the coil effect the current reading you got,
being you seem to be measuring slightly above the coil? To me, it
seems it would being you are not measuring inside the coil windings
themselves, but slightly above the coil. If this capacitance is the
cause of the decreased reading, then yes, it would be totally normal
to see the same results if you flipped the coil and meters. MK