[Milsurplus] "Across The Pacific" PBS Documentary Premiers tonight! (North Carolina)

[MICHAEL BITTNER]

Ken, I have thought all along that your suggestion about the movie-makers misunderstanding the method of winding the loop is the answer. It typically takes about 100 feet of wire to wind a broadcast band loop, so it would take very much more for a resonant low frequency loop.  In any case, if you are going to wind a toroid, you would keep the wire on its spool and pass the spool around the arms of the loop as it unwinds rather than dragging 100+ feet of wire along the floor.  Mike,W6MAB



> On June 9, 2020 at 12:54 AM "Kenneth G. Gordon" <kgordon2006 at frontier.com> wrote:
> 
> 
> On 8 Jun 2020 at 14:38, MICHAEL BITTNER wrote:
> 
> > Regarding the loop antenna, I see now that it amounts to a big, rectangular toroid. Theoretically,  it
> > should not be able to pickup or transmit anything as its magnetic field is confined within its
> > windings, In this case the wooden frame of the loop.  So, I'm still baffled as to how it worked.  What
> > am I missing?
> 
> Well, possibly, because the inherent inter-winding capacitance is being left out of the
> "equation". There was a very short statement within the documentary wherein the maker
> mentioned winding the loop such that it would be resonant at the frequency of interest.
> 
> Anyway, it, apparently, worked when he used it.
> 
> There is also the possibility that the movie-makers misunderstood what he was doing and
> THOUGHT he was winding all that wire around the arms of the loop, when, instead, he was
> winding it all around the periphery of the loop.
> 
> I would like to see his notes on it before I make any judgement.
> 
> BTW, I really thoroughly enjoyed the two hours of the documentary I watched today.
> 
> I can hardly wait to see the third hour.
> 
> Ken W7EKB