Attenuators should be measured with the same setup and philosophy as
filters. They should be placed in a "THRU" or transmission measurement
configuration. One could measure them in strictly a reflection manner
assuming the reflection at the far unterminated or shorted end is 100%, but
the errors will be greater than in the transmission mode. Measured in the
reflection mode, the displayed attenuation will be twice the actual
attenuation.

Dave - WØLEV

On Wed, Aug 25, 2021 at 6:26 PM Donald S Brant Jr <dsbrantjr@...>
wrote:

Mike: You ARE looking at S21 and not S11, right? What does a thru look
like?
73, Don N2VGU

--
*Dave - WØLEV*
*Just Let Darwin Work*