Thanks for all the information on the DS1620.
As it turns out, both of the TBolts (remember I got the from two different
sellers and appear identical) have the Trimble OCXO, v3.00 firmware, but the
DS1620's are marked as follows:
DS1620
0415E2
531AD
DS1620
0239D1
690AB
Interestingly, the first one appears to have been swapped out at some point
(flux residue all over the chip / had to clean it off to read the markings).
I've already ordered another "D1" to swap out the "E2" but really need to
get them both up and running (still trying to figure out how to mount the
antennas!) and see how much difference there really is.
73 Brice KA8MAV
----- Original Message -----
From: "Arthur Dent" <[email protected]>
To: <[email protected]>
Sent: Saturday, September 25, 2010 6:37 PM
Subject: [time-nuts] DS1620 Variants in the Thunderbolt
Heathkid:"What is the higher resolution variant of the DS1620
and how can one tell the difference from the chip markings?”
If you read the middle line on the DS1620 temperature chip
you may see "0310D1" where the 5th character is a capital
"D". The 03 is the year and the 10 may be the month of the
year. The D1 is the revision code. The "C" version was
before maybe 2000 so you won't see those unless they are
used as replacements and the "E" ("bad") revision wasn't
used until late 2004. -Arthur
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