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Re: 1/4 wave theory
Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>
I'll bite: the best is 6% less than 1/4 wavelangth ! Now to talk reality,
That is a long wire and at 120 hz it is not practical for most of us. The
pole pig boys may be able to do it.So we do the best we can and let perfect
be done by preachers.
> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Fri, 15 Feb 2002 13:16:08 -0700
> To: tesla-at-pupman-dot-com
> Subject: 1/4 wave theory
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Fri, 15 Feb 2002 13:42:57 -0700
> Original poster: "McQuay, Michael by way of Terry Fritz <twftesla-at-qwest-dot-net>"
>> From what I've gleaned from the list so far, I fear I may be about to start
> a holy war, but I'm going to ask anyway.
> Is it advantageous to design a coil such that the linear feet of wire in the
> secondary is equal to 1/4 of the operating wavelength?
> There, I've pulled the pin. Let the shrapnel land where it may.
> Here's my situation. I have a secondary that I wound a number of years ago
> that I would like to put into service. I've never ran this secondary since
> I wound it. I'd like to build a tank circuit to excite this thing, so I'm
> wondering if I should use the 1/4 wavelength theory to determine the
> operating frequency of my tank circuit or if there's some other method I
> should use for determining my operating frequency.
> Coil length - 23.625 inches
> Coil diameter - 8.375 inches
> number of turns - 536
> wound with #22 magnet wire
> spaced such that there are about 22.5 turns per inch
> linear feet of wire - 1174.6 ft.
>> From everything I'm seeing on this maillist (and associated websites), it
> looks to me like I may not be able to get very good performance out of this
> coil without rewinding it with more turns. Comments?
> Michael McQuay