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MultiFlex: Why does switching to 40m increase noise floor

Pat_W5WTH
Pat_W5WTH Member ✭✭
edited June 2020 in SmartSDR for Windows
Flex 6400 with latest v3 SW.  If I have two connections to the rig (PC or Maestro, doesn't matter) switching to 40m on one rig will increase the noise floor on the other rig.  The increase only seems to happen when I switch to 40m and it increases the noise floor on the other rig in all bands (especially 20m). 

It's not huge, but it's certainly noticeable. Why would like happen and is it normal?

TIA.
Pat / w5wth

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