[TenTec] Detecting unbalanced feed line currents

Stuart Rohre rohre at arlut.utexas.edu
Wed Jul 10 16:19:44 EDT 2013


With the line isolator(s), feed point balun, tight shield coax, etc., 
etc.  You may not have much RF appearing on the Windom's coax at the 
shack.  If you did, you might notice RF feedback in the radio's audio; 
or a hot shield in extreme cases somewhere along the line.

A few turns of hook up insulated wire connected to a Ma meter, and a 
sensitive milliameter with a germanium diode across the meter terminals, 
should be able to detect if you have outside the shield current, as you 
slide the meter along the coax, with coax inside the coil turns.

Also, as stated in my previous post, if you have unbalanced currents in 
your antenna legs, you may notice a slight directional response toward 
one end of the antenna than the other.  If you are not observing any 
symptoms don't worry, your antenna is working as well as it can.

Stuart Rohre
K5KVH


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