Garmin 18x LVC GPS Navigator Unit Reviews

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Garmin 18x LVC GPS Navigator Unit Reviews


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Garmin 18x LVC GPS Navigator Unit

Garmin 18x LVC GPS Navigator Unit Overview:


  • High Sensitivity LVC Sensor with Bare Wire Connection
  • WAAS Enabled High Sensitivity GPS Receiver
  • Comes w/A Connector End that Can Attach to a CMOS for OEM Applications
  • Non Volatile Memory for Storage of Configuration Information
  • Raw Measurement Output Data for Sophisticated Customer Applications

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Garmin 18x LVC GPS Navigator Unit

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Garmin 18x LVC GPS Navigator Unit Reviews


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8 of 8 people found the following review helpful
5.0 out of 5 stars Excellent PPS time source, April 2, 2010
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This review is from: Garmin 18x LVC GPS Navigator Unit (Electronics)
The Garmin 18x LVC is a bare lead OEM GPS unit with a measurement pulse output aligned to the Universal Coordinated Time (UTC) second, within a maximum error of 1.0 microsecond (1.0 millionth of a second) Only the LVC variety outputs the measurement pulse (Pulse Per Second) signal. As a retail item this unit is primarily used for very accurate timekeeping. One could theoretically use it for navigation, but with bare leads you need to solder a connector on the unit, and there are other 18x models, not the LVC, that have connectors from the factory.

But the 18x models with connectors DO NOT output the precision measurement pulse, so they are useless as reference clocks. You may wonder why anyone would need a clock accurate to within 1.0 microsecond. The clocks inside computers are notoriously inaccurate, sometimes up to an hour off per day. So, the Internet is peppered with reference clocks. People interested in time keeping will place a reference clock server online, and... Read more
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6 of 6 people found the following review helpful
5.0 out of 5 stars Excellent for time keeping, June 22, 2010
By 
Fiat Lux (New Haven, CT) - See all my reviews
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This review is from: Garmin 18x LVC GPS Navigator Unit (Electronics)
This unit is fine for experimenters who can manage a little soldering and a little software, too. You can provide it with 5 volt power and simply use the 1pps output, or you can also connect it to a serial I/O port (default 4800 bps) or a USB-to-serial converter.

I use it with my Ubuntu 10.04 Linux system for ntp timekeeping and for GPS position measurement using xgps and other software. See [...] and [...] for more information.

The 1 usec timing precision is nice, but with common PCs and operating systems, your software timing is subject to millisecond or greater fluctuations. The GPS clock does assure good long-term stability, however, independent of Internet connections.
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3 of 4 people found the following review helpful
5.0 out of 5 stars Works great, October 19, 2009
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T. Shearer (Kingston, WA USA) - See all my reviews
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This review is from: Garmin 18x LVC GPS Navigator Unit (Electronics)
This unit performs well, no trouble getting a signal indoors.
It quit working after 13 months.
UPDATE: failure found due to broken wire, not GPS unit. Unit is still functional.
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