[Elecraft] JUMA PA100 IMD

[Pete Meier]

Folks, I was a bit confused by some the rhetoric here recently about the JUMA PA100.  Some of it based on supposition. I asked my JUMA friends for some information and they provided it. It is posted on their site. So now you can make informed decisions. Here is the info and the link for further details on how it was determined. Please contact JUMA if you have questions.

http://www.nikkemedia.fi/juma-pa100/juma-pa100-imd-measurements.html

JUMA PA100 IMD measurements OH2NLT / 16.08.2012

Measurement setup
JUMA PA100D OH2NLT prototype.
Generators 2 x HP8657B
Dual tone signal combined with Mini Circuits ZX10-2-12-S+ combiner
Dual tone signal amplified for PA100 drive with OH2NLT experimental 10W amplifier
Attenuators Spinner 30dB + 10dB
Control meter R&S NAUS4
Spectrum analyzer HP8594E

Measurement results
Note that delta marker figure seen at the pictures need to be corrected with +6dB to take account second carrier.
Generators combined    third-order IMD -60dBc
Driver amp out @ 1.6W    third-order IMD -45dBc
JUMA PA100 @ 22W    third-order IMD -41dBc
JUMA PA100 @ 36W    third-order IMD -40dBc
JUMA PA100 @ 59W    third-order IMD -38.5dBc
JUMA PA100 @ 90W    third-order IMD -37dBc