I just had a graphic demonstration of the fact Bob mentioned when I was
just rebuilding an old R-390 receiver a few weeks ago. I was pleased
that I saw an AM sensitivity (30% modulation in a 4 khz BW) of 0.49
microvolts for a 10 dB S/N ratio at 26 MHz. I then realized that I had
the IF gain
In writing this, I do so, saying that I find the method to be excellent
and reliable and repeatable with regard to HF radio receiver operation
for all modes.
In general it seems that hams have the more incorrect notion or idea
where more gain is needed to hear a weak signal. To some degree
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