[time-nuts] DS1620 Variants in the Thunderbolt

Heathkid heathkid at heathkid.com
Sun Sep 26 19:56:47 UTC 2010

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:



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" <golgarfrincham at yahoo.com>
To: <time-nuts at febo.com>
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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