In message , Phil
Allison writes




** Not really possible since the FM band is only 20MHz wide.

For a low side local osc:

88.1-10.7 = 77.4 = lowest local osc f

77.4+20.0 = 97.4 = highest local osc f

97.4+10.7 = 108.1 = higher f than any station.

I'm pretty sure that the local oscillator nearly always runs 10.7MHz
HIGHER than the radio signal.




--
Ian