[time-nuts] lunatic fringe time standards

Bob Camp lists at rtty.us
Wed Apr 14 17:03:32 UTC 2010


I *think* you are asking if there's a clock that automatically corrects for
relativity. Simple answer is no. You certainly could do the math in a PC and
then drive a suitable clock with the required offset data based on a known
location for the clock.


Gray code is one of those things that you probably need to go to a PLD /
CPLD / FPGA to get. The simple parts are pretty cheap.


There are a couple of European sources that pop up from time to time selling
Thunderbolts. It appears that 99% of the supply comes from China. At least
here in the US, it's significantly cheaper to ship them in from China than
to buy from a "local" source.


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Eugen Leitl
Sent: Wednesday, April 14, 2010 12:52 PM
To: time-nuts at febo.com
Subject: [time-nuts] lunatic fringe time standards

Hi -- a couple somewhat lunatic questions. Figured this would
be the best place to ask.

Anyone aware of a time standard which compensates in regards
to an ideal flat-spacetime-at-rest-relatively-to-cosmic-background
reference clock? I realize this is not relevant for any affordable

Unrelated, anyone aware of a hardware (IC) counter which
counts in a (local-bitflip) Gray code, so it can track a very
fast (integrated?) oscillator without dropping cycles? 

P.S. Thanks for pointing me towards GPSDOs. Any European/German
local alternatives to the Trimble Thunderbolt?

Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
ICBM: 48.07100, 11.36820 http://www.ativel.com http://postbiota.org
8B29F6BE: 099D 78BA 2FD3 B014 B08A  7779 75B0 2443 8B29 F6BE

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