Topband: Reducing Noise in the Shack

[Guy Olinger K2AV]

On Thu, Jun 21, 2012 at 2:59 PM, DAVID CUTHBERT <telegrapher9 at gmail.com>wrote:

> The W7NQN line filter is a differential-mode filter. You need a filter that
> is designed for common-mode filtering.
>
> Dave WX7G


This is from the web page advertisement:
---------
Compare this with a Brand "C" filter which only handles common-mode
interference problems.  The NQN AC power-line filters are optimized for
common-mode and differential-mode filtering and have about 3 times the
components of brand "C".
---------

Seems to specifically include common mode.

See  http://arraysolutions.com/Products/nqnaclinefilter.htm

73, Guy.