Poorly... very, very poorly. FCC regs state the broadcast PSIP time has to be
with a second of GPS time. Unfortunately many stations send out VERY scuzzy
time data... and complaining to the FCC is useless (I've tried). They are
only worried about Janet Jackson's nipples. All it takes is one station to be
off and your converter/DVR can be practically useless. Apparently many of the
boxes use the same source code that has an uncanny knack for choosing the worst
possible source for their time.
The DTVPal over-the-air DVR was very prone to losing time sync until their
latest firmware (V208) where they now do a weighted median of all the received
stations clocks. They have a debug screen where you can see what the various
stations are sending out.. scary. Why the heck the blithering idiots that
market these things don't offer the option of a manual, line synced clock is
beyond me. My AC clocks are never off by more than a second. The DTV
converters can be off by hours.
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