Thanks for all the ideas and interesting comments.
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I think you are right Tim, the tuner is acting as a filter.
I don’t think I had the problem with a previous antenna - a standard 40m dipole fed with coax.
Maybe the window line to the ZS6BKW is picking up too much noise.
I’ll reinstall that dipole antenna and test again when I get time.
On 22 Apr 2018, at 7:13 am, Tim Gorman <tgorman2@...> wrote:
That's always a possibility.
Some tuners also can act as low-pass filters or even as a parallel tuned
circuit, i.e. a bandpass filter. If the dominating noise contribution
is from a frequency-limited source such as a man-made source both could
work to lower the noise in the receiver. But I don't think this happens
On Sat, 21 Apr 2018 14:10:29 -0400
"Joe Puma" <kd2nfc@...> wrote:
I heard that when you use an antenna tuner you actually raise the
noise floor. 🤷🏻♂️I understand why but never heard it getting rid of
noise. Maybe the tuner provided a better ground then what you had so
yea maybe it made it seem like it reduced noise if your antenna
system is inadequate.