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Re: [Amps] Measuring IMD in a home workshop

To: Peter Bertini <>, "" <>
Subject: Re: [Amps] Measuring IMD in a home workshop
From: Conrad PA5Y <>
Date: Tue, 21 May 2019 10:19:04 +0000
List-post: <>
Hello Peter the best way of generating a clean 100W - 2 tone test is to use an 
ANAN SDR equipped with Pure signal. PowerSDR mRX has a 2 tone test built in. 
Then if you have a good SA just use that. As an alternative to a SA a Perseus 
SDR with an appropriate attenuator will allow you to do a good job.

The alternative is to build a couple of good signal sources or use 2 good 
signal generators with isolators and a class A amplifier that can achieve 
better than -50dBc on 3rd orders. This is quite difficult hence my suggestion 
of using an ANAN with Pure Signal active.


Conrad PA5Y

From: Amps <> on behalf of Peter Bertini 
Sent: 20 May 2019 20:40
Subject: [Amps] Measuring IMD in a home workshop

I'm wondering what techniques others are using to make IMD tests for
external RF power amps using test gear that would be commonly found in a
home workshop.

Spectrum Analyzers are cheap enough--I have several vintage HP 141T
analyzers set up, and a very capable Tek 497P with 100/10 Hz RBW.

My problem regarding two or three tone tests is that my rigs all have
comparably terrible IMD.  Several Ten Tec rigs, and a JRC NSD-515.  None of
them have spectacular IMD performance. How do you get around these
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