Frank Dinger wrote:

Without saying anything, I went over to the
stairway switch and turned it on and off a few times. "On" caused the
interference. When we swapped the bulb with one in a floor lamp, the
floor lamp caused the same interference. It has been one of my enduring
regrets that I didn't ask to keep the bulb. It was probably thrown out.
================
That bulb was probably an old coiled 'Edison' type . They were /are known to
form a tuned circuit resonating in the old TV band 1 ( about 48 - 62 MHz)
acting as a TX when power is applied.

Frank GM0CSZ / KN6WH

Thank you thankyouthankyou! I've been called a crazy liar more than once
over that bulb. There was no channel 1 when that incident happened, but
I suppose that a small change of geometry could raise the frequency. The
explanation in QST had it that the frequency was swept over a fairly
large range as the voltage varied during a cycle.

Jerry
--
Engineering is the art of making what you want from things you can get.
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