Topband: High Pass Filter

[Luciano Nachif]

Gentlemen,
   
  I'm on the market for a high pass filter. What kind of performance should I look for, please?
   
  If you are aware of a store or website where I can buy one, could you let me know?
   
  I do appreciate your comments.
   
  Thanks in advance,
   
  Luciano PT9KK
  Brazil

       
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