jr_dakota wrote:
> In order to double the bandwidth of an SDR, say from 20Khz ro 40Khz
> wouldn't you also have to double the IF from 12Khz up to 24Khz (or at
> least 22Khz)?
>
> JR
An IF of 12kHz can of course have components that go from -12 to +12 kHz, if
that IF value is the center of an I/Q band
downconverted by a quadrature mixer. To process it you need a sampling rate
(theoretical) of 24kHz. Anything more is wasted.
Different is the case of an IF of 12kHz where the lower sideband has already
been suppressed by a previous filter. In
such case, you could conceptually have an upper sideband that extends from
12kHz to whatever value you want, and in that
case the sampling speed can be made higher enough to cope with the signal
bandwidth.
73 Alberto I2PHD
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