[R-390] UnBal for R-390A

[Cecil Acuff]

The common wisdom is to avoid use of the unbalanced connector because it bypasses part of the tuned input stages and leaves some of the performance advantages of those stages on the table to do so...

I would stick with matching to the balanced connector for the best performance.

Cecil
K5DL
  ----- Original Message ----- 
  From: Tisha Hayes 
  To: r-390 at mailman.qth.net 
  Sent: Sunday, January 04, 2009 11:52 AM
  Subject: [R-390] UnBal for R-390A


  Has anyone made a un-bal for the balanced antenna connection on the R-390A to bring it down to a 50 ohm unbalanced connection?

  I have a hand-wound 2.5:1 balun with overlapped windings with Litz wire on a FT-75 core (125 ohm to 50 ohm). What I would like to know is if I should make another one of these things for my other receiver or I should go the easy route and use a single wire into the unbalanced connector or just use the C connector for my antenna.

  My guidebook has been;
  www.dxing.info/equipment/impedance_transformer_bryant2.doc

  It seems that most folks get great results with the easy route. What have been your experiences?

  Any suggestions?



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