[Lowfer] loop performance

[Peter Barick]

Re: Eric's inquiry on LowFER loop shapes for tx

This shape ... that configuration ... but keep in ming the 15 meter
limit for Part 15 ants. Some have extended that to mean a 15M cylinder
and by extrapolation place a 15M sq loop in side. Okay so far, however
converting that dimension to area and reconfiguring that into, say, a
taller shape is incorrect and outside of Part15 regs. I think that may
have been said or implied on this thread.

Peter

>>> JRusgrove@comcast.net 01/28/04 07:32AM >>>
Bill

Which brings up an interesting point...perhaps my RG-11 loop
outperforms your RG-8 loop because mine is in a diamond configuration
(one high support) with no sides parallel to earth rather than the
mil-spec braid being  superior as hypothesized earlier...or maybe a
combination thereof.

Jay
  ----- Original Message ----- 
  From: Bill Ashlock 
  To: lowfer@mailman.qth.net 
  Sent: Wednesday, January 28, 2004 3:34 AM
  Subject: RE: [Lowfer] loop performance


  >Have you seen any difference in performance of loops with equal
wire
  >length but of varying shape?  Specifically, can you tell a
difference when
  >your loop is "perfectly" round as opposed to being something closer
to a
  >square, with essentially horizontal runs near top, bottom, and/or
sides?

  Eric, there's not much difference in the performance of 2500sq ft
loops of 
  varying shapes as long as the lower horizontal portion isn't much
longer 
  than 50 ft. My measurements indicate loops, having the same area,
that are 
  much wider than they are tall have excessive ground losses, but I
haven't 
  put a number on this loss, yet. I also have a hunch that circular
loops have 
  a higher Q than square loops of the same area but I haven't proven
this yet 
  either ....and textbook articles all say there is no difference. Of
course 
  most authors claim the TX loop has no practical value at LF, so what
do I 
  know!

  Bill