Stewart wrote:
> Can someone explain to me why with the standard 5 Pole 2.7 kHz
> filter the DSP FC = 1.6kHz ?
>
> Looking at the NORMed DSP for that filter the LO = 0.25 kHz and
> the HI = 2.7 kHz.
>
> So I would have thought that FC = (2.7 - 0.25) / 2 or 1.225 kHz
> say 1.2 kHz.
> Maybe my idea of what FC represents is wrong..
> 73
> Stewart G3RXQ
Stewart, (put simply)
If the center frequency was set to 1.225 KHz (or close) as you suggest, then
the 2.7 KHz filter would let though too much opposite-sideband energy. We
want some stopping power down close to zero Hertz, so the filter edge is
kept 250 Hz above zero.
Ya?
-Bruce N1RX
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