LF: GPS locked frequency standard

To:	[email protected]
Subject:	LF: GPS locked frequency standard
From:	Paul Nicholson <[email protected]>
Date:	Mon, 22 Jan 2018 06:58:41 +0000
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A GPS based frequency standard I put together over the weekend.

 http://abelian.org/vlf/tmp/180121a.jpg
 http://abelian.org/vlf/tmp/180121b.jpg

Based on a Trimble 57963 GPS disciplined OCXO, I added a divider
and power supply.  It produces signals with very good short
term and long term phase stability.   There is a DC coupled
output (CMOS logic level) and AC coupled (for sound card input).

It's an arrangement I've often used for testing sound cards and
changes to vttime, but each time I cobbled together a divider
on breadboard.  Now finally got around to putting it in a box,
it is much simpler to use.

I'm intending to do a lot more work on the Raspberry Pi and
Octo card combination so will be making plenty of use of this.

--
Paul Nicholson
--

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