Hello,
(It has been a more few years since I designed / developed DSP for spectrum
analyzers for a major company, thanks for your patience.)
I recall that:
sample @ fs -> decimate (toss samples) by a factor of N
is equivalent to
sample @ fs / N
If we wanted a lower sample rate, we would:
sample @ fs -> lowpass filter at (say) 80% of (fs/2) / N -> decimate
Otherwise all of the energy > 50% of (fs / N) gets aliased into your data.
Why not just sample at 100 kHz?
What am I missing ?
Thanks for considering,
Scott W7SLS
> On Nov 3, 2019, at 12:59 PM, Jan-Derk Bakker <jdbak...@gmail.com> wrote:
>
> Is this not caused by the fact that I'm currently subsampling the ADC
> (conversion rate 10Msps, rate into the microcontroller 100ksps by dropping
> 99 put of 100 samples)?
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