In article , Dave Plowman (News)
wrote:
In article , Jim Lesurf
wrote:
Must be legacy technology. The FM tuner in my Sansa Clip+ can't have
many coils, given that they fit the FM stereo tuner (biggest
weakness - no dedicated antenna terminals), a computer (with DSP),
EPROM (firmware), two banks of gigabytes of RAM, headphone amps,
jacks, color display, pushbuttons and a battery in less than a cubic
inch.

So how does it filter/suppress the 19kHz pilot tone and the remains of
the 38kHz DSBSC after stereo demodulation?

Maybe like my old Quad FM3 tuner - don't bother to?

The diagram I have for the FM3 shows it using an MC1310 followed by a pair
of active LP filters. (The FM4 seems to use the Toko type '21 filter
modules. But I don't know the filter shapes for these as they don't give a
part number I could trace to any of the Toko sheets I have.)

Slainte,

Jim

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