[Lowfer] Small loop calculator

[Dave Pick]

A DDRR eh?
I remember a pirate ship in the 70s trying one of those, I think it worked
until the sea got at it...
See about three-quarters of the way down this page for pictures, the "MV
KING DAVID".
http://www.marinebroadcasters.com/links/links4.htm

Dave.

2009/6/7 Paul Daulton <k5wms at aristotle.net>

> In the Editors and Engineers Handbook there was an antenna called the Dual
>  Discontinuity Ring Radiator. It had two loops separated by a few feet,
> bottom loop was closed top loop broken at feed point. Top loop fed with
>  matching stub. Makes a compact loop for 80m I never calculated one for
> 505khz. Both loops are horizontal which makes the ant vertically
>  polorized( polarization is perpindicular to the plane of the loop). If
>  anyone is interested I will try to find that handbook.
> Are you installing the  loop in the horizontal plane?
> It will be neat to have a station on in AK to listen for.
> PAUL DAULTON
> k5wms at aristotle.net
> Beacon WMS qrss 30/slow 187.492 khz 24/7
> EM34wu
> Jacksonville, AR USA
> -----Original Message-----
> From: Laurence BY3A-KL1X China <hellozerohellozero at hotmail.com>
> Sent: Fri, 5 Jun 2009 22:38:50 -0800
> To: <lowfer at mailman.qth.net>
> Subject: [Lowfer] Small loop calculator
>
>
>
>
>
> If been trying to calculate what sort of Voltages and impedances Im going
>  to be faced with on my LF/MF loop in Alaska at 505-510kHz compared to
>  137khz and been fiddling with the values of
>
> length diameter, capacitor values and voltages...
>
>
>
> http://www.66pacific.com/calculators/small_tx_loop_calc.aspx
>
>
>
> Im not sure given the real world of heights, ground permitivity, true
>  conductor/skin whether it holds thru but plumbing in the figures for past
>  oprations, in order of values it appears to give rationale figures. In
>  all cases it tells me to keep the length less that 0,25Y...
>
>
>
> Other good educational reading and the politicking of when a small becomes
>  intermediate or large, and some good telling graphs on the links below.
>
>
>
> http://personal.ee.surrey.ac.uk/Personal/D.Jefferies/loop.html and
>
> http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=15200
>
>
>
>
>
> Anyone have any novel methods of feeding say a 470ft circumference loop at
>  505khz down to coax in the end welcomed....
>
>
>
> Laurence WE2XPQ as of next week...
>
> BP51 Wasilla AK
>
>
>
> Presently OM89UA China.
>
>
>
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-- 
G3YXM IO92BK Birmingham UK