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Steve and others,
To add to the reports of Icom receiving
characteristics, my ''756 Pro2 shows the increasing noise on the
bandscope below about 200 kHz but it is not obvious in the receiver channel
(the bandscope is a separate fixed gain receiver and visual display, the
receiver path has AGC and filter selection, etc, but both use the same
conversion oscillator that does the main tuning and thus gives tracking of the
bandscope). Some account would need to be taken of a droop
in response at lower frequencies of the front end RF transformers, and I
understand this is less in the Pro3 than the Pro2. It would need some
SINAD tests to show if there is a increasing "phase noise" penalty with tuning
lower on LF.
My receiver of choice for LF is a TS-850, and
while it too has some droop with RF response across LF, the external
QRN is still the dominant noise source.
73, Bob ZL2CA
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