On Fri, 19 Aug 2005 16:00:47 -0700, running dogg wrote:

Alexander Kozik wrote:



Basically it's due to bad design. All radios have an IF that reduces all
incoming signals to a single frequency that then is used for audio
output. If you're hearing an internally produced harmonic, then it
usually means that your radio is suffering from a design flaw, or that
there's some bad parts. Considering how cheaply these Chinese radios are
made, it's not surprising that some would have such poor design and/or
build quality that internal harmonics or "birdies" would be all over the
place. If your radio can't properly handle the IF, then it follows that
SW signals will have images too. Such a radio is practically useless for
DX.


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Not a ''bad design'', just a cheap one.

There are probably close to a billion single-conversion radios with
untuned front-ends out there, providing lots of enjoyment.