Choice of 455 kc and 10,7 mc as IF frequencies

[Dave Rickmers]

Joe Buch wrote:

> The higher the IF
> frequency, the wider the selectivity for a given number of stages and IF
> transformer Q.  Some automobile receivers in the old days used 256 KHz IF's
> to improve selectivity.  The Hammarlund HQ-180 uses a final IF of 60KHz to
> provide optimal CW and SSB selectivity.

Hallicrafters and (hi-end) Drakes use 50 kHz final i.f.dr

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