[Elecraft] PSK31

[Don Wilhelm]

Chas,

OK - I now believe we are doing the semantics thing.  Yes, my use of the
term 'shape' can have any center frequency.

My references are to the SHAPE of the bandpass are indeed divorced from the
absolute center frequency on the X-axis -- (only the frequency delta from
the center of the bandpass is relevant), and I believe you are including the
X-axis absolute frequency in referring to the filter 'shape'.

I consider the filter 'shape' as a parameter separate from the absolute
center frequency (+/- Hz from the center of the filter = shape) - sorry if I
confused anyone - but that's the way I learned it way back when!!!

73,
Don W3FPR

----- Original Message -----
>
> Well, the shape is the same if you mean it has three peaks and two
> valleys.  But the frequencies and absolute and relative amplitudes are
> different.  For example, take my USB setting using Spectrogram v6:
>
> FL1, 2.48 khz BW, BF1 138, peaks at 353@-71dB, 1074@-63dB, 1922@-75dB
>
> FL2, 2.48 kHz BW, BF2 122, 752@-66, 1455@-65, 2306@-78
>
> FL3, 2.48 kHz BW, BF3 161, 360@-68, 1163@-70, 1772@-79
>
>