How to synchronise two stations running wspr ?

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How to synchronise two stations running wspr ?

I would like to compare my antenna to my friend antenna.
He lives 1km from my house so we hope propagation conditions would be the same.
We plan to run both stations with the same power on the same band for a few hours and then we could make some statistical comparisons.
But we would like to transmit on the same time slots. If we use tx factor of 20% for example, transmit slots will be chosen at random
by both software and will not always be the same.
If we set tx factor to 100% of course transmit period would be the same.
Is there a way to synchronise the two software with a txfactor different from 100% ?