Yes one can run any stages in class C with a FSK signal with no issues. In
order to have IMD issues there must be 2 or more signals present at the same
time. With FSK only the carrier frequency exists although it changes the
required shift frequency amount and at the baud rate.
Bob, K4TAX
Sent from my iPhone
> On Sep 22, 2014, at 6:42 PM, ken.d.brown@hawaiiantel.net wrote:
>
>
>
> If you use what I call "real FSK" there is only one tone being sent at
> any one time. There is no carrier that needs to be suppressed as in AFSK
> to a rig in SSB mode. There is only one tone so there cannot be any
> intermodulation. Then you can run your gain stages in class C and have
> class C efficiency.
>
> DE N6KB
>
>
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