[Elecraft] K2 Narrow Spaced DR Measurement

[John Oppenheimer]

While evaluating a receiver design, a K2 Narrow Spaced Dynamic Range
measurement was performed to validate the test bench. The K2 plot is on
the page: https://www.kn5l.net/newReceiverProject/plot-IMD/

If the two line equations are used, the Noise floor is -138 dBm and 2kHz
dynamic range is 87 dB. These are close to the Sherwood values of -136
and 80. The K2 settings are my normal operation IF/AF BW settings, which
is a little narrower than the Sherwood measurement parameters.

The question is the low level IMD measurement points do not follow the
line equation. Is this expected?

Guess I need to order a $60 Mini-Circuits ZFSC-2-6+

John KN5L