Concerning the poor (2X 2nd I.F.) rejection, 2nd LO leakage back into
the 1st mixer can also cause this problem. I remember this problem with

My radio has 3 or 4 local oscillators. It's a triple-conversion reciever on
lower frequencies and a quadruple-conversion receiver on higher frequencies.

There are three IF frequencies listed for it in the manual.

It doesn't list a fourth IF frequency, but since it's quadruple-conversion on
higher frequencies, I'm assuming that it also has a fourth local oscillator.

Or am I way off-base here?