[Amps] Measuring IMD

[Jim Barber]

In my mind, this side-thread with the diode detectors has more to do 
with loading and operating than testing. I wouldn't suggest it be used 
as a substitute for IMD testing a new design.

Without any field experience on my part, it seems it could be useful to 
build such a gadget into a homebrew tube amp. In that context, it 
wouldn't be useful in a SS amp - at least one that uses conventional 
broadband design.

Even though I *can* generate a two-tone signal in DSP in two of my HF 
rigs, I won't bother to specifically test IMD every time I load an amp 
on a new frequency or at a new input level. If I had such a gadget 
built-in, however - that might be useful.

My .02,
Jim N7CXI

On 11/3/2013 10:04 AM, peter chadwick wrote:
> Manfred,
>
> For SS amps, the detector approach has the problem that it doesn't readily bring out the generally poor high order IMD of SS amps. For tube amps, it's adequate.
>
> 73
>
> Peter G3RZP
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