[time-nuts] Upgrading old Thunderbolt?

Pete Rawson peterawson at earthlink.net
Sat Sep 25 04:20:28 UTC 2010


The OXCOs are identical on the schematic, but pinout patterns vary.
At least mine did, which can be cobbled around, but not fun.

Pete Rawson

On Sep 24, 2010, at 6:18 PM, Bob Camp wrote:

> Hi
> 
> The new-er ocxo's are available on the e place for about $50. Replacement tbolts are $60 to$120 on the same site. The ocxo's all look like they will swap with each other.
> 
> Bob
> 
> 
> 
> On Sep 24, 2010, at 3:49 PM, David Martindale <dave.martindale at gmail.com> wrote:
> 
>> Suppose I have an old Thunderbolt that works, but has the old Piezo
>> OCXO.  Is it feasible to upgrade it "in place" by obtaining one of the
>> newer Trimble oscillators from somewhere (or something equally good
>> that fits mechanically)?  Does the Trimble OCXO need different
>> operating parameters than the Piezo one (e.g. gain)?
>> 
>> (I have seen John Miles' page
>> <http://www.thegleam.com/ke5fx/tbolt.htm> that describes replacing the
>> old OCXO with a HP 10811.  But that won't fit in the original case and
>> requires an extra power supply voltage.  If I need to buy a better
>> OCXO anyway, why not one that fits the available space and operates
>> from the available power?)
>> 
>> Or would it just make sense to buy a more recent Thunderbolt for $200?
>> 
>>    Dave
>> 
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