Hi Paul,
what a neat layout! :-)
73, Marco IK1HSS
P.S. a bit out but tuned to LF/VLF... I'll support the wish of Roger
concerning an EbNaut idiot's guide.. I made some test when started the
first LF transmission but I forgot all about SL config etc.. I mean
that if somebody will so kind to write the guide probably more reports
arrive ;-)
----Messaggio originale----
Da: [email protected]
Data: 22-gen-2018 7.58
A: <[email protected]>
Ogg: LF: GPS locked frequency standard
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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