[GreenKeys] True FSK vs AFSK

[Paul Kasley]

Don't know. I feed audio from my compy into my K3. DDS chips are easily 
shifted. And way back, I switched a cap in and out of the VFO of my 
AM-only DX100.

Agreed, more sophisticated digital modes require audio generation and 
processing.

Simply responding to the original question as posed - yes, there can be 
a benefit to FSK v AFSK.

-w9ts

On 2/4/2022 12:42, Jim Haynes wrote:
> On Fri, 4 Feb 2022, Paul Kasley wrote:
>>
>> Directly shifting a carrier oscillator eliminates the audio chain and is
>> essentially CW.
>
> However, is that the way modern radios actually generate FSK?  and CW?
> Or do they actually generate AFSK internally and put it into the audio
> chain?
>
> And, given that we have dozens of digital modes these days that all begin
> by generating audio frequency signals, is AFSK for FSK any worse than
> any other digital mode?
>
> Granted that it's possible, easy in fact, to generate crud on the air by
> feeding audio into the SSB transmitter.