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In Reply to: RE: The antenna posted by rick_m on May 14, 2015 at 08:33:02
So what frequency cleared up the wooziness? If you can remember....also, how finely can you tune the thing?
"So what frequency cleared up the wooziness?"
I don't recall exactly but it was in the direction of the nominal frequency, maybe about 1 Hz.
"how finely can you tune the thing?"
Well, I didn't know so I just tried. It's an old analog Fn Gen. with an internal counter having 1Hz resolution in the 2-20 Hz range. But it looks like you can get 0.1Hz deltas fairly well if you use an external counter. The limit is just the resolution of the single turn pot which covers a decade of frequency along with the patience of the shaky ol' knob turner. I didn't assess drift but I suspect it's OK after a warm-up.
"I don't recall exactly but it was in the direction of the nominal frequency, maybe about 1 Hz."
Can you please translate that. What I was asking was what was the frequency relative to 7.83 Hz was the one that didn't make you woozy - 7.85 or 8.10 or 7.75 or some other frequency? What frequency made you woozy, the 7.83 Hz? Just curious.
The generator was lower than the "nominal" frequency but I'm not sure just how much.
I was in the middle of something else and just did the trial for the hell of it. I was shocked as could-be that there was ANY effect and there it stands. Try it! We've already spent far more time chatting about it than I did doing it. My little "experiment" was just of the poke it and see what happens nature and it took all of maybe ten minutes to set up.
It might be interesting to try different modulations to the source both AM and FM. I bet there would be a good market for electronic doormats that make peddlers feel uncomfortable and decide NOT to ring your doorbell...
....would it work on the Jehovah's Witnesses who seem to find our country abode quite an attraction, apparently. (I didn't even know they had JWs down here in NZ; I thought they were a strictly northern hemisphere phenomenon.) ;-)
You'd prolly have to switch the drive cable polarity. Or just lay it upside down.
The "Doormat of Discouragement" (tm) has a grand future worldwide...
Both good questions.
AND, which schemeatic did you work from to get a stable =~8hz?
Making a loop as in the photo is very easy. A little shelac or epoxy and it would even be fairly mechanically stable.
Too much is never enough
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