[Elecraft] Re: Displaying the keying waveshape on Spectrogram.

[Masleid, Michael A.]

Hello Guy,

>There is a point to using the widest possible SSB filter on the
>receiver feeding Spectrogram. First off, it helps to get the entire
>curve in one picture. Also once you exceed the +/- bandwidth of the
>"significant" click energy, further bandwidth does not change the
>curve anymore, and you get a reading independent of RX bandwidth.

>Practically speaking, being able to see up and down 1000 Hz will be
>more than enough to show a good or slightly bad signal quite
>accurately.

OK, true enough, to a point.  The SSB filter is being used as a band
pass filter.  The band pass filter should pass all of the signal
to make a measurement.  But, the curve is being made by Spectrogram.

The resolution (bandwidth) being used in Spectrogram is rather tiny.
Like 3 Hz?  That's the filter I'm worried about.  It needs to be wide
enough to capture the energy, say 500 Hz, 1000 Hz?

73, de Michael, AB9GV