tuning to LSB or USB even tho the signal is AM

DXers are well aware of this technique, but I'd like to
point it out for the record: if you have severe selective fading,
causing distortion when trying to listen to a program, such as is the
case here with WOR on WWCR 5070, UT Sun 0230, you can eliminate this
problem by tuning to LSB or USB even tho the signal is AM. Selective
fading occurs due to the fact that the lower and upper sidebands of
the AM signal are at slightly different frequencies and thus fade
independently, intermittently cancelling each other out when both are
being heard in the AM mode. On a receiver such as the ATS-909, you
can eliminate one of the sidebands and thus the mutual interference.
With a strong signal it will be necessary to back off the RF gain
while you are at it; and with tuning steps such as on the 909 of 40
Hz, it could be that you can't get an exact zero-beat on the carrier.
It doesn't matter whether you pick LSB or USB (assuming the signal is
truly DSB AM) unless you also have some interference on the other side
to eliminate. Furthermore, listening to AM in an SSB mode can "even
out" a heavily fading signal and depending on the receiver, may well
invoke tighter selectivity and greater sensitivity (gh)