[PCR-1000] Noise Floor

[Bryce Ringwood]

Hi

Thought these variations were just due to the points where the
different front end filters cut in?  - refer pcr-1000 service manual.
-Bryce

>>> stewart.bryant@virgin.net 09/24/02 09:43PM >>>
Eduardo sent me the trace. I get something similar to
this with mine, but I would need to check it to see
what frequencies the transitions occur at.

I wonder if what we are seeing is a software artifact
where Icom are appling an S meter correction to correct
for sensitivity. We would expect to see this at some
frequency because the definition of S9 is different
in a VHF vs HF receiver.

What needs to be done is to do a test of minimum
discernable signal either side of the transition
and see if this corresponds to the change in reported
signal level.

That will allow us to distinguish between a real
change in sensitivity and a measurement artifact.

73

Stewart


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