On 11/11/2017 09:26 a.m., Bill Shell N6WS wrote:
Hello,
While using FT8 in a DXPedition setting, there may be conditions where
there is no reliable timing source for syncing of the system clock.
Bill,
When my Internet here in Costa Rica has been down, I've been able to
sync my system clock adequately closely by using WWV and using the
Windows clock set feature to set the clock, by simply setting to the
next minute and then clicking the Apply button as the time comes around
to zero seconds. After doing it a few times, you can nearly always get
the hang of it and get it within a second or so. Close enough that I've
gotten by. It's a nuisance and takes a bit of practice, but it can be
done in a pinch. And it's gotten me back on the air many times.
Per your request, though, I envision a clock set feature whereby you
would set the receiver to zero-beat WWV, and call a special clock set
routine that would look for the top-of-the-minute tone at the right
audio frequency and at approximately the top of the minute. When it
sees the tone appear at the right frequency, and at about the right
time, it sets the system clock accordingly. In my professional work,
before the advent of the Internet, I used hardware clocks based on such
a system, and they seem to have worked reasonably well most (though not
all) of the time.
That would only work, however, in parts of the world where WWV is
available. When I lived in Africa many years ago, however, WWV was
rarely audible, but there was a different time signal that I could hear,
a digital signal of some sort, and I have no idea where it originated
from (EU maybe?) or what the protocol was. Something that uses that or
other protocols might be useful in those regions.
Scott Bidstrup
TI3/W7RI
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