[Amps] Checking for IMD

[Tom W8JI]

> The way it was stated you seemed to imply that there is 
> slim to no chance it
> is useful for anything. Or did I take that wrong?

You took that wrong. My point is we should learn what it 
does and call it what it actually is.

> A false good from a receiver with poor IM performance 
> would be caused by??

I didn't say from a receiver with good IM response but a lot 
of unusual things can happen. Receivers can desense or gain 
compress from strong nearby signals. A strong signal 
adjacent channel could reduce receiver gain. Anyone who 
tests receivers knows about being misled by things like 
that.

I'd like to see how it works on a half dozen common 
receivers both over the air and on loads. One major 
difference between analyzers and receivers is ingress into 
the system from power mains and such. I'm sure a good 
protocol and guidelines could be developed and it would be 
useful for something in most cases.

I'm almost leaning more towards AGC off, an attenuator, and 
a sound card program. With careful adjustment it might be 
possible to get 50dB or more DR and use a voice signal.

What spectrum programs are around?

73 Tom