Re: [RTTY] Fun, but

[Kok Chen <chen@mac.com>]

On Mar 1, 2009, at 2:32 PM, Jay wrote:

> As the FT-1000 just automatically takes
> AFSK and makes FSK its all moot in any case.

Isn't it the other way around? :-)

Even if you select "FSK" on the front panel of the FT-1000D, it is  
really doing AFSK.

The FT-990 and FT-1000/D take an FSK keying signal, uses that to key a  
simple AFSK generator inside the rig and from then on behaves just  
like AFSK, but with the audio processor forced off.

One of the names given to such a scheme is "Keyed AFSK," the internal  
AFSK generator is keyed by an external FSK keying signal.

 From the FT-1000MP on, the FSK keying signal disappears into a DDS  
chip, presumably to generate direct FSK. But who knows what kind of  
FSK wave shaping occurs inside the chip :-).

73
Chen, W7AY

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