[time-nuts] Advantages of GNSS ???

[Bob kb8tq]

Hi

It depends a lot on the offset you are looking at. For close in phase noise, you probably don’t 
want high drive. If you are only after phase noise past 10KHz, you may not want / need
an OCXO in the first place. Selecting crystals (like one in a hundred) for very high drive /
low phase noise setups *is* done. It’s just not very practical. 

Bob

> On Jul 10, 2019, at 3:49 AM, Leo Bodnar <leo at leobodnar.com> wrote:
> 
>> From: Bob kb8tq <kb8tq at n1k.org>
>> Drive power on an OCXO will pretty much always be below a milli-watt. A typical design will be in 
>> the range of 1/10 to 1/100 of that power level. 
> 
> It depends whether OCXO is designed for long term stability and low ageing or low phase noise.
> Low ageing requires low drive but low phase noise needs as much drive as humanely possible - often approaching mW levels.
> 
> Leo
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