To All from PA0SE

Dave, G3YMC wrote

3.  On the subject of receive notes.  I also noted that Harry optimises

his

filter for 1kHz.  Many operators including myself prefer a lower note,
600-800Hz or even lower.  I suspect it is the optimisation of the

frequency

relative to background noise, and with a narrow audio filter may be less
noticeable>

The Swedish thesis shows that around 500Hz the ear/brain is at its best in
copying wek signals in noise.

73, Dick, PA0SE