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Topband: vertical balun

To: topband <topband@contesting.com>
Subject: Topband: vertical balun
From: Bob Kupps via Topband <topband@contesting.com>
Reply-to: Bob Kupps <n6bk@yahoo.com>
Date: Fri, 29 May 2015 21:13:50 -0700
List-post: <topband@contesting.com">mailto:topband@contesting.com>
Hi we have a 30m top loaded monopole with the feed point about 2m above a large 
ground radial field. Right now we are feeding it through a 4:1 balun (not a 
unun) with 12.5 ohms on the balanced side, and the SWR is 1.4 with no matching 
network. Is this balun acting as a common mode choke? Do we even need a choke? 
Would an unun be better?

Thanks 73 Bob HS0ZIA
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