In article ,
"Joel Levine and Barbara Pickell" wrote:

You cannot generalize about single and double conversion. To simplify a
bit, the designer selects the IF as a trade off between image rejection and
selectivity. On double coversion sets the first wider IF provides the
required image rejection while the lower frequency 2nd IF provides improved
selectivity. However, you can also achieve improved selectivity with the
crystal filter. Since the SX110 has a crystal filter, the relevent question
is how effective is that filter.



The SX-110 is a step up from a 5-tube superhet. There is on RF stage, a
mixer/oscillator stage followed by the IF strip with 2 IF amps. There
is a xtal filter in the IF strip which will help with adjacent-signal
interference. The RF stage will help a bit with image rejection, but I
wouldn't expect it to be very good.

Dave