[TowerTalk] Coax Stubs for SO2R

David Robbins k1ttt at verizon.net
Wed Sep 9 12:09:50 EDT 2015

on open stubs I recommend cutting back the center conductor and closing the shield over it, but of course not connected to it.  this prevents the possibility of noise getting coupled on the shield from getting into the receiver.  also note that there is going to be high voltage (and current) on either shorted or open stubs at one end or the other, usually one is high at one end and the other at the other end.

Sep 9, 2015 12:02:18 PM, warrenwolff at aol.com wrote:


It has been a good while since I employed stubs on
an old BC-610.

Open stubs scared me because I was worried about a
voltage appearing at an open stub. Besides, it is
a bit trickier to "tune" an open stub.

I went for a half wave shorted tuned to the second
harmonic. No voltage threat plus is was simple to
tune it by pushing pins through the coax near the
final shorted end. NO instruments needed other than
the S-meter on the adjacent receiver.


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