> So then none are using a true FSK generator ???
No, *ALL* are true FSK - they shift *one* oscillator in the transmit
chain just not necessarily the VFO. However, shifting the VFO is not
the definition of FSK any more than keying the VFO is the definition
of CW.
73,
... Joe, W4TV
On 8/23/2011 6:31 PM, Ed wrote:
> On 08/23/2011 06:26 PM, Joe Subich, W4TV wrote:
>>
>> > I may be missing something here, but how are the newer rigs generating
>> > FSK ? Are they shifting xtals or just sideband tones ?
>>
>> Depending on the design they are using different approaches ... some
>> are generating audio tones (at a fixed level relative to the carrier
>> oscillator into the balanced modulator), some are directly shifting
>> the frequency of the carrier oscillator (a synthesizer, not a crystal)
>> and one is directly generating the FSK signal using DSP at a low IF.
>>
>> 73,
>
> So then none are using a true FSK generator ???
>
> Ed W3NR
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