[time-nuts] Sneaky Errors

J. L. Trantham jltran at att.net
Wed Oct 19 20:24:14 UTC 2011

As Hal says and as in instrument flying, three independent sources of data
before reaching a conclusion.  If one disagrees, throw it out.

A third source is in order.  A third TBolt, an LPRO-101 adjusted to and
compared regularly to each TBolt, or another GPSDO of another flavor.  Also,
a CS unit that can be turned on or off to compare.


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Hal Murray
Sent: Wednesday, October 19, 2011 3:03 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Sneaky Errors

> I have two thunderbolts, set up so that I can switch over to the backup
> if the primary fails. All is well with that, but what could I do to detect
> less obvious failure, like 9.999999 MHz output?

> If they disagree, I don't know how to resolve which is correct. 

Get a 3rd.  2 good guys can outvote 1 bad guy.

These are my opinions, not necessarily my employer's.  I hate spam.

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