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Old 4th Dec 2022, 11:03 am   #332
regenfreak
Heptode
 
Join Date: Nov 2018
Location: London SW16, UK.
Posts: 655
Default Re: 6-gang FM stereo tuner heads

I can see a pattern. Every crystal reduces the RBW by about a third. So a cascade of 7 poles of crystals may bring it close to 1 Hz RBW. I havent found an example of 1Hz RBW filter schematic yet.
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