francesco messineo wrote:
It's hard to explain why to ones not familiar with weak signal
operation between broadcasting signals, but really the noise floor
raise a lot when you have some 5 or 6 broadcasts signals in 500 KHz of
band (all with power levels of at least 10 dB more than the levels
used in amateur radio, often +20 dB more)
I would need some more fundamental understanding of the system and needs
to be able to understand how you come up with the above noise level at
100 Hz.
as I said, if it's not possible or not practical, of course I'll take
what I can get. The receiver will be limited by its phase noise and
not for example by its IMD3.
I think already -110 dBc/Hz at 100 Hz is better than any LO in
commercial receivers (for ham radio at least).
But why at 100 Hz offset. Are you looking for weak signals 100 Hz away
from the strong interferer? (and are worried about reciprocal mixing
from the LO) That would imply that the interferer has equally good
phase noise, and that's not particularly likely?
If you want to be a good spectrum citizen and have a real clean
transmitter... (or you're doing some experiment where you are doing
some sort of radio science, and need a clean, clean tx)
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