----- Original Message -----
From: "Ashlock,William" <[email protected]>
To: <[email protected]>
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:[email protected]]
Sent: Monday, May 20, 2002 1:14 PM
To: [email protected]
Subject: LF: Re: RE: Re: Re: [Lowfer] RE: litz wire
----- Original Message -----
From: "Ashlock,William" <[email protected]>
To: <[email protected]>
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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