[Lf] GPS timed signalling]

[Andre' Kesteloot]

Talbot Andrew wrote:

> [...]
> On another issue, the AD9850 DDS board firmware has now been modified to
> allow an external timing signal for chip updata.  Now, the controlling
> PC can issue frequency / phase update information, and this is not sent
> to the DDS until 3us after a 0 to 1 transition on the trigger input.  By
> using a GPS receiver to generate the trigger pulse,  slow PSK and FSK
> locked to exact UTC seconds becomes realisable.  This removes the need
> for clock extraction in any practical link and thus should be capable of
> giving a good few more dB in link margin capability.  As UTC seconds
> pulses derived from even a low cost GPS module is exact to 1us or
> better,  worldwide, the possibilities are endless...............
>
> SMT Hell and DFCW software will soon be suitable to allow GPS timing
> locked transitions in these modes.
>
> Andy  G4JNT
>
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