Exactly right!  And MUCH more than "a bit fussy" -- these are passive networks, and ALL passive networks depend on both source and load impedances being right. Don't expect something like this to work right (or handle power) with non-resonant antennas.

73, Jim K9YC

On 12/27/2017 9:18 AM, Bob McGraw K4TAX wrote:
Do be mindful that these units are  a bit fussy regarding operating in applications where the SWR may be high.   Thus they really prefer installations where the impedance if near 50 ohms otherwise where the SWR is low, usually less than 1.5: 1 or so.


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