[R-390] R390A alignment question

[Tisha Hayes]

The stagger tuning is to maintain the bandwidth of the radio when operating
with a 16 KC bandwidth setting. If you seldom use the 16KC setting like when
listening to a nice, clean SW or BCB station then you "could" go with a more
conventional alignment and just peak to 455 Khz.

The IF gain will be higher with everything across the board at 455 Khz but
the overall bandwidth will be reduced. The stagger tuning is to give the
radio a more linear response across the maximum bandwidth.

If sensitivity and selectivity were your only concern then the tank circuits
could be changed to eliminate any Q-spoiler components. In a non-perfect
world the Q would be so high that the radio would have absolutely no
bandwidth and only be good for listening to CW. So it all depends upon how
faithful you want to stay to the original design and intent of the radio or
how much you want to modify it to fit your listening needs.

I find that the 16 kc bandpass filter is just a bit too broad. I wish they
had an additional 12 kc setting that would be a better fit for SW/MW
listening.

-- 
Ms. Tisha Hayes

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"I will not recant the truth. I am corn, not chaff; I will not be blown away
with the wind or burst by the flail. I will survive both."
-Walter Milne, 1558