JUMA PA100 IMD

[PeteWK8S]

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
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[Jon Kåre Hellan]

On 08/20/2012 02:12 PM, Pete Meier wrote:
> 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

Any reason data for 100 W aren't given?

Jon LA4RT
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[Jim Brown-10]

On 8/20/2012 5:12 AM, Pete Meier wrote:
> some the rhetoric here recently about the JUMA PA100.  Some of it based on supposition.

There was good reason for the "supposition" here -- there were no
technical specs on the website.

73, Jim K9YC
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[Pete Meier]

The testing was limited to 90W due to limitations of the prototype PA100 used. Please follow the link for futher details on the test setup and procedure. I believe it is explained there.

Pete WK8S