[time-nuts] Setting Time on WSPR Radio Transmitter

Brian Lloyd brian at lloyd.aero
Fri Jun 22 14:41:50 EDT 2018

On Fri, Jun 22, 2018 at 1:27 PM, Hal Murray <hmurray at megapathdsl.net> wrote:

> brooke at pacific.net said:
> > I'm experimenting with a WSPR beacon transmitter and part of how it works
> > depends on pushing the start button at exactly  2 seconds past the
> minute.
> What do you mean by "exactly"?

I think WSPR has a +/-2s window for the start of a transmission. It really
isn't all that "exact" and certainly nothing in the way of time-nuts
definition of accuracy.

The most popular WSPR implementation runs on a PC and uses a sound-card to
generate the baseband signal and then uses an SSB transceiver to upconvert
to the desired output frequency. Even worst-case the standard NTP
implementation on Windows is more than sufficient for synchronization.


Brian Lloyd
706 Flightline
Spring Branch, TX 78070
brian at lloyd.aero
+1.210.802-8FLY (1.210.802-8359)

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