[Lf] Re: 85 Hz vs. 75 Hz

[David L. Wilson]

I have put a plot at
http://www.erols.com/dlwilson/shift85.gif
to demonstrate the problem of 85 Hz appearing as 75 Hz if 75 Bd FSK.
I did not have a single channel demonstration available; notice how also
there appears to be more than 85 Hz beteen the channels though it is also
85 Hz.

The sound file was generated using a Wavetek Model 404 VFT test set and
analyzed using SpectraPlus with screen capture using PaintShop Pro.