[Premium-Rx] Wellbrook excellence !

[Rich MC Clung]

Here's an amplifier and loop antenna that works well. 
  Go here:
  http://tinyurl.com/y39vl7
and look in the Untuned Loop Folder.
   
  Then look in the Orthogonal Loop Folder to see what I am using.
   
  RICH  WA6KNW
-------------- Original message ---------------------- 
  From: Al Klase
   Alberto and the Group, 
  I too am an antenna experimenter, and one time manufacturer. I don't at all blame Well brook for protecting their intellectual property, I potted the magic bits of the antenna I sold years ago. Anyway, to make a loop work without tuning it to a specific incoming signal, you probably need a "tranimpedance" amplifier that converts the current in the loop to voltage on the output. Such a device will have a very low input impedance, like for instance, the summing junction (- input) of an op amp. See:  http://www.vlf.it/lowfloop/lowfloop.htm 
  Problem is, it's difficult to get this working above MF. I don't think the Dallas Langford circuit is applicable here. If anybody has any ideas, let's hear them. Loop antennas have a lot to offer, especially if we don't  have to retune when we change frequency. Regards, Al
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