It should be easy enough to characterise the response at various
signal levels and AGC settings using a decent signal generator
with programmable modulation. Also should be possible to look at
the output from a 48/96kHz stream via a VRX as compared with the
AF output. That way you could find the actual characteristics of
the demodulated output and compare it directly with the input.
On 06/11/2019 15:45, AndersH wrote:
I am often studying the spectrum from NDB stations as a part of
NDB DX:ing. The signals are normally A3A, a few ones are A1A,
I have noted (without claiming generality) that very strong
pulsating side-bands can be a bit "rounded", whereas fainter
pulsating side-bands are "more square".
None of this interferes with my specialty, but it made me think
about the amplitude versus gain characteristics in the signal
DX:ing is a hobby in a strong transitional phase with an ever
increasing percentage of digital modes and pulse pattern detection
techniques as part of the fun.
I believe that there is no such thing as "obtaining too much
knowledge": in this context. When we are no longer asking
questions, we are probably already on the morgue.:-)
All the best and 73!
Perhaps you could detail the "phenomenon" that
prompted your question.73 Alan G4ZFQ