[AMRadio] AM Transmitter "quality"

[Larry Szendrei]

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.

73,
-Larry/NE1S

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