What time is it?
Chris Tran GM3WOJ / ZL1CT wrote an article about getting accurate time on your PC for the GMDX Digest
What do you do when you need to know the exact time? You look at your phone or your watch, or you look at the time on your laptop or iPad etc. All very easy if you have internet connectivity or mobile phone coverage (and if your watch battery has not gone flat)
All right – what do you do if you are on a DXpedition to a remote (Pacific or Scottish) island where there is no mobile phone network and the internet connectivity is patchy – sometimes disappearing completely for hours or days? Not a problem – most laptop internal clocks only lose or gain a few seconds per day – perfectly OK for logging the DXpedition QSOs – yes?
No – DXpeditions at this low point in the sunspot cycle need to operate FT8 and FT4, both of which modes rely on very accurate timings for the transmit and receive periods. FT8 transmissions last for 12.64s in a 15.0s period, FT4 transmissions last for 4.48s in a 6.0s period – you cannot use either mode if your PC clock is inaccurate by any significant amount.
Read the article at