[time-nuts] Thunderbolt Power Supply Question

Ed Palmer ed_palmer at sasktel.net
Mon Apr 26 14:11:59 EDT 2010


Hi Bob,

Where did you find that 10% spec?  I looked in the Tbolt book and the 
data sheet but didn't see it.

Ed

Bob Camp wrote:
> Hi
>
> I'd say those are all pretty safe guesses with any modern OCXO. The drop out
> on the internal regulator is likely to be well below anything we would put
> on the +12 supply. 
>
> The Trimble spec on the TBolt shows a +/- 10% tolerance on the +12V supply.
> From that I'd assume you could run the unit pretty much forever at 10.800
> volts on the input. 
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Arthur Dent
> Sent: Monday, April 26, 2010 12:36 PM
> To: time-nuts at febo.com
> Subject: [time-nuts] Thunderbolt Power Supply Question
>
> The +12VDC supply (internal to the sealed oscillator) supplies both the oven
> and the oscillator circuits. I think you'll find that internally this +12VDC
> goes to the heater circuit as well as through a regulator to the oscillator
> which is running on something like +7VDC. This is speculation at this point
> but a number of similar type oscillators I've checked are set up this way
> and even have a temperature compensated regulated reference voltage out of
> about +7VDC to feed a pot or EFC circuit. For instance the HP 10811 has an
> internal +5.7VDC regulated supply for the oscillator circuit
>
> One crude way to check is to take a removed 10Mhz oscillator Trimble
> oscillator and power it from a bench supply at +12 and let it stabilize.
> Then reduce the supply voltage slowly and see where the output level and/or
> frequency start to change. If you see no change until you've reduced the
> voltage a few volts then the oscillator has an
>  internal regulator for the oscillator circuit.    
>
>
>
>       
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