[Amps] Compact Coil Concept

[wc6w at juno.com]

Hi everyone,
  Thanks for the comments on my coil idea.

  No one mentioned in either public or private communication that it has been tried...so, I guess it is up to me.  :-)

  I'm not particularly worried about breakdown between the windings.  There should only be about 1000 volts between the worst case turns.

  
  To elaborate just a smidge, here is a side view of the concept
    ... if it survives text "graphicizing" 

--- Just about to scale on a 19" monitor set at 1024 wide ---
    

|<--------------------- 6" ---------------------->|

     10M   20M       40M               80M 
      |     |         |                 |   

        0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
                                          2 0 0 0 1
0  0  0                                   2 0 0 0 0 -- 160 M








0  0  0                                   0 0 0 0 0
                                          0 0 0 0 0
        0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0					


  The winding transitions between layers at the 1's & 2's
  
  Input is at the left and band taps are spaced as shown (more or less).


Just for the history file, some other approaches I considered were:

  A pair of spirals mounted in the same position as the concentric portion.  The center parts of these really don't contribute much and winding them would be more difficult.

  A Powdered Iron toroid core coil.  At legal limit power this is physically just as large as the concentric portion & costs a bit more.

  Mechanically inserting enough core material to increase the effective mu of the 10-80 meter portion to 2.  Too "mechanical", & requires too much space to park the core.  


73 & Good evening,
  Marv WC6W










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