[time-nuts] Ebay FE-5680A Rb: Are they that good?
smither at c-c-i.com
Fri Dec 9 21:51:07 EST 2011
Bob Smither wrote:
> My documentation states that the full range of adjustment is:
> 7f ff ff ff => +383 Hz
> 80 00 00 00 => -383 Hz
This scale factor is clearly wrong - using it and applying an appropriate
correction changes the frequency way too much.
(thanks Jose!) a better estimate is 140000 / Hz.
Using data after 20 hours:
the estimated frequency offset is 1.36E-3 Hz. Using the above scale factor
gives a correction of -190 counts. Here is the command I used to (temporarily)
program the new offset:
2e 09 00 27 ff ff ff 42 bd
(the bd is the exclusive-or checksum of the offset)
Now I wait ...
Bob Smither, PhD Circuit Concepts, Inc.
A government which robs Peter to pay Paul can always depend on the
support of Paul.
--George Bernard Shaw
Smither at C-C-I.Com http://www.C-C-I.Com 281-331-2744(office) -4616(fax)
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