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: [email protected] [mailto:[email protected]] On Behalf Of Arthur Dent Sent: Monday, April 26, 2010 12:36 PM To: [email protected] 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. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
