Message-ID: <001401c20280$10da3300$a0e5fc3e@l8p8y6>
From: "hamilton mal" <g3kev.ham@virgin.net>
To: rsgb_lf_group@blacksheep.org
References: <DDC408CAE72CD511827A0002A5131CD6D9F5E8@exc_wil08>
Subject: LF: Re: RE: Re: RE: Re: Re: [Lowfer] RE: litz wire
Date: Thu, 23 May 2002 18:33:49 +0100
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----- Original Message -----
From: "Ashlock,William" <William.Ashlock@edwards.boc.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Wednesday, May 22, 2002 4:11 AM
Subject: LF: RE: Re: RE: Re: Re: [Lowfer] RE: litz wire


> Mal,
>
> As the result of becoming gray from learning how to do things the hard
way,
> I now conclude that it is far better to FIRST lay out the theory of what I
> am intending to design. This would include a sufficient number of
equations
> describing the behavior of all the variables. Then I do the best job I can
> to verify the math using bench tests of all components. As a final step I
> determine if the performance of the design is as predicted from the math.
If
> not, I go back to the design equations and determine what went wrong and
> then begin the process over again. Note, that for LF antenna designs where
> nothing is a certainty, my approach is NOT to simply set up a the new
> antenna and call up my friend 40 miles away and ask for an S reading.
>
> In terms of the use of #12 Litz wire (the subject of miles of postings
over
> the last two weeks), I have just designed a 4X #12 cable for my 50'/50'
loop
> using the above approach that has an AC resistance including ground loss
of
> 0.39 ohms. As far as I know this is the lowest resistance ever achieved
for
> a TX loop antenna of this size at 185k. And yes, anyone doubting this
> measurement, may stop in and check it out.

Hello  Bill
These are excellent figures, the best I have ever seen. Everyone in EU is
screaming to the ARRL and the FCC to permit you folks to use 1W erp. I have
calculated the amperage to  you loop to achieve this 1W erp and the figures
frighten me. You said your loop was suspended amongst trees and I would say
with this high amperage I will be able to see your smoke signals  before I
hear you signal. Let us have your calculated antenna amperage to see if my
figures compare?

Mal/G3KEV

>
> Thank you for the help in the soldering problem my friend but I do not
wish
> to continue a dialog of 70% unmeasured, and unverified BS.
>
> Regards
> Bill
>
> -----Original Message-----
> From: hamilton mal [mailto:g3kev.ham@virgin.net]
> Sent: Monday, May 20, 2002 1:14 PM
> To: rsgb_lf_group@blacksheep.org
> Subject: LF: Re: RE: Re: Re: [Lowfer] RE: litz wire
>
>
>
> ----- Original Message -----
> From: "Ashlock,William" <William.Ashlock@edwards.boc.com>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Friday, May 17, 2002 8:39 PM
> Subject: LF: RE: Re: Re: [Lowfer] RE: litz wire
>
>
> > Mal,
> >
> > >I have wound a loading coil using decca 729 strands litz and another
> 2.5mm
> > >teflon insulated wire one and compared results. On air measurements and
> > >reports are identical, regardless of what theory dictates.
> >
> > Am I going to have to send you a loading coil made from #12 copper and
and
>
> Bill. Try HW #12 pure copper tube, not the alloy mix you get these days
for
> commercial wiring and plumbing, even better SPT (silver plated tube tube)
> Gold plate tube even better, very low RAC. These are all easy to solder
and
> although hard to get out perform all other varieties, available in all
sizes
> from diameters barely visible to sizes that need a fork lift to move
about.
> 73 de G3KEV
>
>
>
> > another with identical dimentions from #12 Litz to prove to you there is
a
> > 2x reduction in Rac? Assume you have a way to make these measurements?
> Using
> > on-air measurements as a way to measure a change less than 3db is not a
> > sound approach, especially if the A/B change can't be accomplished by
> simply
> > flipping a switch. This change in fact could be under 2db due to the
> > additional series resistance in the circuit added by soil loss.
> >
> > Regards,
> > Bill A
> >
> > _____________________________________________________________________
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>
>
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