TopBand: BC "Trapper" Trap Design (Long!)

[George Guerin]

     Hi Jeff & the rest of the Top-banders
     
     Jeff did a nice write up here.  Yes, 5X4F had one for a while and left 
     it with ON6TT for use in other African countries. 
     
     One thing we did instead of GE Silicone sealant was to use "Plastidip" 
     tool handle coating as a sealant.  It can be thinned with mineral 
     spirits or T.E.R.P.S.  It comes in colors and clear.  We used mostly 
     black for UV resistance, clear where we didn't want to cover the PVC 
     caps.  If your parts and hands are clean it truly helps the Plastidip 
     or Silicone bond to the coax and PVC.  (no oils, no dust).
     
     The Battle Creek Special group still supplies a 2:1 or 2.25.1 UnUn for 
     160 operation, where the impedance of the inverted L is about 25 ohms.
     
     The best reference for trap theory is from QST, Dec 84, pp 37-42, 
     "Optimizing Coaxial-Cable Traps" by Robert C. Sommer, N4UU.
     
     Other articles are in October 81 HR and May 81 QST.   Charlie, W0CD 
     and I just reviewed them last night.
     
     For John, ON4UN, this write up from Jeff would be good material for 
     your revised Low Band DXing book.
     
     73  all    George  K8GG

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