[ARC5] Easy selectivity improvement....Mutual coupling measurement

[Bill Cromwell]

On 05/08/2013 04:44 PM, Bruce Long wrote:
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> You know at some point it is possible to mix the arc-5 IF frequency to some other common IF frequency such as 455kHz or 9 MHz, pass the signal through a commercial narrow fileter and then use the same stable LC or xtal 2nd LO to heterodoxy the filtered signal back up to the ARC 5 IF frequency.
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> bruce
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Hi Bruce,

I have considered doing that. Aside from watching out for new birdies in 
the scheme, some of us prefer a Rube Goldberg approach (evil grin). 
That's really just a small twist on the Q5er approach and even closer to 
the variable passband circuits (non DSP type). Single band receivers 
make the spurious/birdie thing easier.

73,

Bill  KU8H