From: "Hal Murray" <>
Sent: Saturday, November 26, 2011 6:58 AM
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Subject: Re: [time-nuts] PC time app
david-taylor said:
Yes, although from some GPS devices the jitter may be worse than from
Internet servers (depending on your connection).
I've been looking for "good", low cost GPS gizmos, preferably with no
soldering required. If anybody finds one, please let me/us know.
The best I've found is the Garmin GPS-18x. It is only "good" if you can
use
the PPS signal and it requires some soldering.
All the low cost GPS unit's I've tested have horrible jitter. They are
crappy without PPS support.
[]
I do agree with Hal's comments. The one other unit I've found is this
one, which I know I've mentioned here before:
http://www.satsignal.eu/ntp/Sure-GPS.htm
but again some assembly is required, including soldering. It can take its
power from a spare USB port.
I did test the GPS 18(x) with a USB to serial adapter, and the PPS/DCD
line was passed through, allowing NTP to work rather better than pure LAN
sync, but not as good as a direct connection to the serial port DCD line.
Not all USB/serial adapters and their drivers work as well.
Cheers,
David
--
SatSignal software - quality software written to your requirements
Web: http://www.satsignal.eu
Email: [email protected]
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