David J Taylor wrote: > OT: GPS18x LVC failure > > My GPS18x LVC stopped working a couple of days ago. There appears to > +5V going into the unit, and the serial output is stuck around -5V with > no signs of data on the 'scope. Garmin have accepted the unit back for > checking, but I wondered whether anyone else had seen a failure?
Mine hasn't been used continuously for a while but was working ok last I tried. Due to problems interfacing my Conrad module via usb-serial converter (it's very erratic at best or plain just doesn't work), I decided to buffer the radioclocks, GPS18X-LVC and BR304 via 1488 ttl to rs232. The +/-10V converter chips I ordered didn't arrive and reverted to short lead time, so I'll have to test with supply from bench psu. Whilst seeming to work ok with serial port on the server, failure with usb-serial has made me suspicious that pull down on ttl outputs may be marginal and real rs232 levels might give improved timings, and 30 pence for the buffers seems a good precaution. Did you try an additional pullup to +5V just in case it's was internal one that's blown. David _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
