Yes, that's what I thought as well, until I bought and tested one and
found out that - in practice - they need an even /better/ set of GPS
signals than a simpler position GPS/PPS.
Since that's not my experience (even with poor antenna position) I'm
curious which unit you were using.
Venus838LPX-T. Seems to go into a non-locked state for a proportion of the
time but still emits a PPS signal, which increasingly deviates from true
UTC. That's using a 25 mm square 28 dB active patch antenna, similar to the
antennas on other similarly located GPS receivers. This was indoors, on the
top floor of a two-storey building, with just the power fed to it, watching
the LED flash.
Maybe I was unlucky? I wonder what experience others have?
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