Bill W5WVO wrote:
In WSJT's FSK441 screen, there is a useful little window that plots
* the amplitude of the noise floor and the decoded signal burst, if any,
* against audio frequency. Since FSK441 uses four tones ranging in
* frequency from 882 Hz to 2205 Hz, the net passband (after all
...If the equaliser users infinite impulse response filters,
it may actually exacerbate group delay problems (although it might also
cancel some of the group delay variation from the IF filters).
It does not. The Rx (and Tx) equalizers are entirely FIR-based.
73,
Lyle KK7P
David Woolley (E.L) wrote:
The reason that the decoder can cope with up to 400 Hz off frequency
is probably because there are receiver filters around that will allow
that, but I don't see that that is a reason for always making the
receive filter that wide. The system has been clearly designed
Of course, the very best thing you can do in that respect is move QTH
out to the middle of Kansas somewhere. :-)
Jericho, Kansas?
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Yeah, that sounds like a good place! :-)
(I'm a big fan, too.)
Bill W5WVO
Lyle Johnson wrote:
Of course, the very best thing you can do in that respect is move QTH
out to the middle of Kansas somewhere. :-)
Jericho, Kansas?
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In WSJT's FSK441 screen, there is a useful little window that plots the
amplitude of the noise floor and the decoded signal burst, if any, against
audio frequency. Since FSK441 uses four tones ranging in frequency from 882 Hz
to 2205 Hz, the net passband (after all stages) should ideally be
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