We just tested a new batch of KPA3 modules and compiled data on their
3rd-order IMD performance. This topic has been of interest lately, so I
asked Eric to post a typical plot (20 m, 100 W):
http://www.elecraft.com/K3/K3_100W_20M_TX_IMD.jpgThe scale is adjusted to show increments of 3 dB and make it easy to
read the IMD value. Following the industry-standard measurement method,
we set the two tones to -6 dB in relation to 100-W peak carrier power.
The 3rd-order products are at approximately -35 dBc. This performance
is excellent. Unit-to-unit variation is about +/- 2 dB on this band.
We plan to post a full range of additional K3 test results as time
permits, including many more plots like this one.
73,
Wayne
N6KR
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