[Elecraft] MMTTY FSK

[N1JM]

Good point not poiny :-).


On Jun 13, 2010, at 5:18 PM, Mike Cox [via Elecraft] wrote:

> The only real difference I've heard is that on some strong signals you 
> can occasionally hear the unwanted sideband mirroring the intended AFSK 
> signal. This signal is at a level reduced by the unwanted sideband 
> suppression characteristics of the transmitter involved and separated by 
> twice the modulating tone frequencies. This might put the two signals 
> over 4 KHz apart, making it not apparent who the culprit is. It's pretty 
> easy to see the problem with a panadapter. Note that some current radios 
> (for example. IC756ProIII) only rate their transmitted unwanted sideband 
> suppression at -40 dB (K3 is -50 dB). Some older radios are much worse. 
> An unwanted sideband of -40 dB from a 1.5Kw signal would be 150 mW. I've 
> worked DX with less. 
> 
> On 6/13/2010 17:07 PM, N1JM wrote: 
> > In  real world operating, has anyone really experienced a difference or could 
> > tell a difference? 
> >     
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