Thread: Intermediate Frequency
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Old September 8th 06, 09:04 PM posted to rec.radio.amateur.homebrew
i3hev, mario held i3hev, mario held is offline
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First recorded activity by RadioBanter: Aug 2006
Posts: 16
Default Intermediate Frequency
wrote:

This is not that hard and there are tricks to do this over
very wide ranges. The easiest is create a fixed 90 degree
reference and down convert it.

that's true but, imho, there's no meaning in removing the (moderate)
complexities of the typical superhet receiver just to put (trickier)
complexities in quadrature downconverting... apart from part count,
controlling the reciprocal phase in two "identical" converters is in
itself not an easy task, since just a single degree of dephasing is
enough to degrade unwanted sideband rejection.

... Those two things
are not easy or cheap.. yet. But we are getting there.

I'm sure we will get there soon enough, and it may
well be that just a few years will suffice; but, as
for now... they are not easy or cheap!

--
73 es 51 de i3hev, op. mario

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