"Marty" <w8ak...@gmail.com> wrote: > My noise level was at –140 when I decided to change bands. Upon changing > bands, I went to tune the antenna. Noticed the tuner was not powered on , > when I turned on the ac power to the tuner, the noise level on the 5000A > went from –140 to –120. > The noise level also rises on my rig when I power the tuner, simply because the tuner is no longer bypassed and is passing on more of the antenna signal. -140 seems low for the background on the HF bands so this may be true in your case.
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