[time-nuts] Unified VCXO Carrier Board

Bob Camp kb8tq at n1k.org
Fri Oct 23 07:12:40 EDT 2015


If you are buying the “right” 0.5 ppm / C resistors, they often run well over $10 each. You have
a *lot* of them in a circuit….


> On Oct 22, 2015, at 5:09 PM, Dimitri.p <dimitri at dotp.com> wrote:
> The price of the resistors is small change compared to the $8 connector for the 10811.
> Then again maybe the plan is not to actually build one board with all the parts that will accomodate any of the OCXOs on the list
> Dimitri
> At 04:44 AM 10/22/2015, Bob Camp wrote:
>> > 2. It provides unified tuning: 0V = lowest possible frequency, 3V3 or 5V = highest possible frequency, no matter of the VCXO tuning sense and range.
>> That immediately gets you into op amps and feedback resistor stability. With a number of combinations, the required resistors can get pretty expensive. It
>> also gets you into dual supplies with some OCXO’s.
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