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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