[time-nuts] GPS clock to RT-Linux for pulsar machine

Magnus Danielson cfmd at bredband.net
Fri Jul 1 21:01:24 EDT 2005

From: "Tom Van Baak" <tvb at leapsecond.com>
Subject: Re: [time-nuts] GPS clock to RT-Linux for pulsar machine
Date: Fri, 1 Jul 2005 17:48:08 -0700
Message-ID: <005601c57e9f$b800fee0$4023f304 at computer>

> David,


> To avoid a large number of administration and
> synchronization problems, how about not directly
> linking the PC or OS clock to the ADC sample
> clock at all. Instead, inject a full-scale <100 us
> wide GPS 1 PPS into the ADC input itself. That
> way your continuous serial ADC data stream also
> contains embedded UTC "ticks", for free.

This has already been proposed earlier in the thread and David is going that
way. The question was really more which PPS is which UTC second so that was the
residue problem. Tossing NTP or NMEA at it should work.

Since David have 16 channels using one for PPS was not a real problem.

Magnus - hacking away on a GPIB tool, Z3801 ordered

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