My take on this is baluns are baluns and common mode chokes are common
mode chokes. In many cases baluns do not provide adequate common mode
choking requirements. Thus both may be needed. Usually, the balun is
located physically at the load and the common mode choke is located at
the source. In certain antenna configurations, a balun is used at the
feed point along with a common mode choke and then a 2nd common mode
choke at the source is required as well.
73
Bob, K4TAX
K3S s/n 10163
On 10/25/2015 10:09 AM, Brian - N5BCN via Elecraft wrote:
Don,
Yes, things settle down with a dummy load, so it looks like I'm dealing with
RF feedback.
Per the original post, I'm using an Elecraft BL2 balun at the
coax/ladderline junction. Shouldn't this act as the common mode choke that
you suggest or are you suggesting to place a common mode choke in addition
to the balun?
Interesting idea regarding the KPA100 latest version since 40m is the
troublesome band. I purchased the KPA100 around 2011-2012, so I would think
it has the latest hardware but I'll double check when I get a chance.
73 Brian, N5BCN
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