[Elecraft] Balun loss

Tue Dec 16 12:40:19 2003

The K2 will appear as a balanced source with one end having about 10 pF =
to earth ground. I have run the KX1 this way. I was able to reverse the =
GND and HOT leads from a wire vertical with no change in the ATU tuning. =
When the K2 is operated this way the case will be hot with RF. One-half =
of the P-P RF voltage will appear on the case. For example, when running =
12 watts into  a 600 ohm load the RMS RF voltage is 85 volts. The case =
will have 43 VRMS on it. Something to consider if you are wary of =
E-fields. I don't worry too much because if I can't see it it can't hurt =
me.

  Dave

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Rick Dettinger
Sent: Tuesday, December 16, 2003 9:59 AM
To: [email protected]
Subject: [Elecraft] Balun loss

The thread about feedline loss reminded me of a question that I have =
been meaning to ask:  If my K2 is sitting on my wooden bench on its =
rubber (or plastic) feet with no ground wire and powered by battery, is =
the output ballanced or unballanced?  I realize that it is unballanced =
with respect to the common radio ground but not real earth.  Also, while =
I often hear concern expressed about balun losses with high, reactive =
loads,  the first thing I see in a ballanced antenna tuner such as my =
BLT looks alot like a balun wound on a torrid.              73 - Rick    =
K7MW=20

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