|[AMRadio] AM Transmitter "quality"|
ne1s at securespeed.us
Wed Sep 16 10:38:19 EDT 2009
Jim W4ENE wrote:
> It is the sudden cutoff that the ear dislikes.
> I point out the my old 51J4 sound pretty nice if
> the mechanical filter is kicked out. Why? Not
> only because of the increased bandwidth of the
> I.F. but rather because the shape of the top of
> that filtering system is so rounded. The cutoff of
> the audio frequencies is quite gentle. Not all
> that wide, but the descent into the stopband is
> pretty gentle.
Very true. My R390 sounds so much better that my R390A when receiving a
good-quality AM signal at any given position of the bandwidth switch
appropriate for AM reception, and I've always attributed it to this.
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