[time-nuts] T-Bolt oven / LH question

Don Oconnor eGunk at wowway.com
Sat Oct 13 17:33:40 UTC 2012


Bob and George

I now believe my T-bolt is operating correctly.
Upon power-up the cooled T-bolt draws about 700mA on the +12 supply until
the oscillator warms up. I also misunderstood the temperature sensor and the 
temperature displays on the LH software

Thanks for your assistance.

Don O'Connor



> Hi
>
> If you leave the unit off power for a couple minutes, does the +12 current
> start at something higher than 150 ma? It should be well above 500 ma at
> turn on. If not, then the oven in the OCXO isn't doing it's thing.
>
> Bob
>



>You're probably OK. The T'bolt doesn't report oven temp, but rather the
>temp near the edge of the pwb some distance from the oscillator. Think of
>it as the environmental temp inside the package. If you ever look inside,
>look for an 8 pin Dallas Semi IC that is labeled DS1620; it's right behind
>the DB-9 connector - that's where the temp is measured.

>73,
>
>geo - n4ua

>
> Hello all,
>
> I recently purchased a ThunderBolt on eBay. I believe the T-Bolt's
> oscillator oven is not operating correctly. But, having never used a
> T-Bolt
> or Lady Heather software I'm not sure.
>
> Why I believe there is a problem:
>
> 1.    The T-Bolt's external case is barely warm (my guess about 100F)
>
> 2.    The positive 12 volt power supply current remains steady at about
> 155mA
>
> 3.    The temperatures displayed on LH software.
>             Near the top left of the screen in white 22.29C
>            Underneath in red -16.3C
>             At bottom of screen above graph 16.2C
>
>
> Question, is this normal? Do I need to enable the oven or change a
> temperature setting?
> Thanks in advance.
>
>
> Don O'Connor
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