[Elecraft] K3 and Datamodes

[Bob Nielsen]

But will it drive a local loop?

(Just kidding, I dumped my model 15s several years ago)

:^)

Bob, N7XY

On Jun 6, 2007, at 10:32 AM, <ab7r at cablespeed.com>  
<ab7r at cablespeed.com> wrote:

>
>
> Well, either way, the good news is that the K3 will be able to do  
> both!  :)
>
> Greg
> AB7R
>
>
>
> On Wed Jun 6 13:00 , "Julian G4ILO" sent:
>
>
> On 6/6/07, Vic K2VCO <vic at rakefet.com> wrote:
>
>> The point that I'm (still) missing is how is a good AFSK signal is
>> supposed to be different from a 'true FSK' signal as G4ILO suggested.
>
> I didn't suggest it was different. I was suggesting that it was easier
> to tune because, as Bob said in his reply, you can fine-tune by
> clicking on the waterfall display which adjusts the mark-space tones,
> instead of having to take your hands off the keyboard or mouse and
> twiddle the receiver knob.
>
> Greg makes a fair point about FSK potentially being cleaner, but I
> would be interested to know if that is really the case. Certainly if
> the audio was overdriving the transmitter you could radiate a dirty
> signal, but if the system is properly set up would there be a
> noticeable difference?
>
> With FSK there might be the possibility of clicks or artefacts
> occurring during the change between mark and space. A
> software-produced AFSK could ensure that the transitions occur when
> the wave passes through zero, which would result in a cleaner signal,
> surely?
>
> Whether that's true or not, I would have thought the usability
> benefits of the AFSK method, especially in a contest situation, would
> outweigh any theoretical advantages of FSK, which are probably
> undetectable on the air, even if they are measurable.
> --
> Julian, G4ILO
> G4ILO's Shack: www.g4ilo.com
> K2 s/n: 392 K3 s/n: ???
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