On Tue, Aug 11, 2020 at 08:02 AM, Danny K5CG wrote:
However, slide 12 is not correct in the suggestion that Return Loss is always
a negative number. That is simply not the case.
The reflection magnitude in db is always a negative number, yes. Expressing it
in terms of "LOSS" is negative by implication and is thereby expressed as a
positive number. A reflection -20db down (negative) from the incident is a
return loss of 20db (positive loss). This shouldn't be confusing to anybody,
much less HP or even tomatoes.
It is incorrect but so many people do it even in engineering literature. The editor of IEEE transactions got concerned about it and wrote this article...
Roger
Roger Need