I seem to have a timing issue with a HP 58534A smart antenna; the NMEA refclock is always about half a second out and never gets selected:
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Many thanks,
Mark

Mark,

Could it be that your PC is looking for the wrong edge? There's a configuration option to select either edge. My PCs look for a positive going transition on DCD (low to high volts, 0V to +5V for my GPS 18x LVC).

Cheers,
David
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