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.
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

On Sat, 09 Aug 2003 17:35:45 -0400, Jerry Avins wrote:

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

Love that byline.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

For proper E-mail replies SWAP "-" and "_"

Why is it that Democrats can't debate politely?
And are only rude and interruptive.
Lack of mental capacity?

On Sat, 09 Aug 2003 17:35:45 -0400, Jerry Avins wrote:

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

Love that byline.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

For proper E-mail replies SWAP "-" and "_"

Why is it that Democrats can't debate politely?
And are only rude and interruptive.
Lack of mental capacity?

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.

I found such a bulb in the loft of the garage of a house we were
renting in the mid-1950s. I had read an article about them somewhere,
so I took it inside, screwed it into a lamp near the TV, and, voila,
instant Channel 3 TVI (that was the main channel in Milwaukee,
WI, then). I put it in a box in my shack, and didn't think about it for
some time.

I put up a tower and 20 meter beam. Before the coax was in the house,
a neighbor sent his kid over to complain about TVI. I invited him to
come over and see that the TV in my shack was not showing any
interference, but he declined, and continued to complain over the next
few months.

While preparing to leave for two weeks vacation, I had a flash of
inspiration. I put the bulb in a lamp, connected a timer to the lamp,
and put it in a closet (so the light couldn't be seen in an otherwise
dark house). The timer turned the bulb on during evening TV
hours.

I left it on for several days after our return. The neighbor never
complained of TVI again.

73, John - K6QQ, glad for the statute of limitations.

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.

I found such a bulb in the loft of the garage of a house we were
renting in the mid-1950s. I had read an article about them somewhere,
so I took it inside, screwed it into a lamp near the TV, and, voila,
instant Channel 3 TVI (that was the main channel in Milwaukee,
WI, then). I put it in a box in my shack, and didn't think about it for
some time.

I put up a tower and 20 meter beam. Before the coax was in the house,
a neighbor sent his kid over to complain about TVI. I invited him to
come over and see that the TV in my shack was not showing any
interference, but he declined, and continued to complain over the next
few months.

While preparing to leave for two weeks vacation, I had a flash of
inspiration. I put the bulb in a lamp, connected a timer to the lamp,
and put it in a closet (so the light couldn't be seen in an otherwise
dark house). The timer turned the bulb on during evening TV
hours.

I left it on for several days after our return. The neighbor never
complained of TVI again.

73, John - K6QQ, glad for the statute of limitations.