[time-nuts] Thunderbolt temperature sensor [WAS: Recommendations for a newbie?]
Charles P. Steinmetz
charles_steinmetz at lavabit.com
Sat Sep 8 17:01:19 UTC 2012
Bob wrote:
>The strange temperature chip in the later TBolts isn't much of an
>issue. The chip is poorly located for temperature control. It only
>seems to impact the plots on Lady Heather. Trimble wasn't bothered
>enough by it to patch the firmware.
My experience is consistent with this. While switching the chip on
one, I used the opportunity to bring the chip temporarily outside of
the Tbolt housing on a cable to investigate whether the Tbolt makes
any use of the temperature data. Neither freeze spray nor bringing a
soldering iron near the chip, when it was outside the Tbolt housing
and the housing was insulated from the changes in chip temperature,
seemed to have any effect on the operation of the Tbolt, either
normal or in holdover. I have also run Tbolts with the new
temperature chips for long periods, and have not observed any
systematic differences in performance between them and units with the
older chips, either in normal operation or in holdover.
I suspect that the temperature sensor was provided so telcom
operators could get a rough idea of the temperature in remote
cell-site transmitter shacks.
Best regards,
Charles
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