Re: Low Pass filter inductor question. #filters


Yes, both legs must be switched.   The reflection of the if the unterminated filter will be across the 
one in use.   At a bare minimum you have to test to insure it will work but generally its going to
be trouble.

Its not a shared ground.  Its the shared hot!  What does a 40M filter look like at 20M?
What does a 20M filter look like at 40?  Hint the 20M will pass 40M signals (and possibly harmonics),
But the 40M will not pass any 20M signals.  So a filter that does not pass 40M across a 20M filter
has to have bad effects.

You  need two sets of contacts.  


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