[time-nuts] T-Bolt Temperature

Michael Blazer mblazer at satx.rr.com
Fri Aug 17 01:38:42 UTC 2012

Do you know the part number of a chip to replace the DS1620?


On 8/16/2012 5:58 AM, Arthur Dent wrote:
>> I have two Thunderbolts that I'm monitoring with
>> Lady Heather.  The temperature on the older unit
>> (MFG 2/26/2004) seems to track the
>> environment.  The newer one (MFG 11-24-2004)
>> shows 44.750000 °C and only changes in increments of exactly 1°.
> All REV-E Thunderbolts with date codes after about mid-2004
> used the DS1620 "E" chip and have this problem. Buyers have
> been told and believe the REV-E units are somehow superior to
> previous revisions so they will ask a known problem unit. I think
> they have seen articles on the internet that show really old units
> with the noisy Piezo OXCO and somehow believe that only the
> REV-E Thunderbolt has the newer Trimble OXCO, which is not
> true. After about 2001 all REV-A through E Thunderbolts had the
> new Trimble OXCO. I doubt you could find any with the older
> Piezo OXCO now.
> As far as I know there is only one U.S. seller of Thunderbolts on
> Ebay that replaces the DS1620 in these affected REV-E units
> with one that will display correctly with Lady Heather. I've heard
> several stories from buyers who have bought problem Thunderbolts
> from resellers, many of whom don't do any real testing to see their
> units work properly or are stable. Ask questions before you buy.
> -Arthur
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