On Thu, 2007-01-18 at 14:46 -0800, Dennis OConnor wrote:
> Good stuff Martin.. Most informative... When I get some time I will put the
> Hewlett Packard scope on the O2 and see what I see...
> I understand with DSP rigs why there will be an initial delay from the time
> that an RF impulse is applied to the antenna input until audio output
> occurs... All this processing overhead affects how fast the rig can turn
> around on qsk... TT seems to feel the Orion will hold up at 30 wpm... I am
> hearing signals at 30 wpm with the O2 but as I commented I do not know how
> much they are truncated - though it is still useful as I can tell what
> activity is happening... Your work seems to suggest quite a bit of
> truncation...
>
> There is a Tom who was quite vociferous about the QSK timing problems with
> the Omni series... Since I have one of those I was going to cobble up a quick
> n dirty analog transmitter / receiver and see what the fastest clean QSK
> could be had with starting and stopping single oscillator chains... Haven't
> had time to follow up on that yet...
>
Chirp city. Time delays worse the higher the oscillator tuned circuit Q,
worst with a crystal. Vintage rigs like the Viking Ranger had a
sequential keying scheme that held the PA off while the VFO or crystal
chirped but claimed QSK with the receiver on a separate antenna.
Mixer transmitters keying the MIXER get truly rapid keying without that
chirp problem.
> denny
>
>
73, Jerry, K0CQ
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