[time-nuts] Spectrum Analyzer Specifications --> phase noise test set

jimlux jimlux at earthlink.net
Fri Mar 25 13:55:59 EDT 2016


On 3/25/16 5:07 AM, Bob Camp wrote:
> Hi
>
> The reverse isolation issue is indeed one of the weaknesses of this setup. For testing
> OCXO’s isolation is not a big deal. A normal OCOX has very good output buffering
> to give it the stability you are after. If you are running (maybe) a VCO with no buffering, that
> assumption falls apart. The VCO will  / can injection lock through the mixer. In that
> case you *do* need an amp to provide enough isolation to prevent the injection lock.
>


But if someone were building a little module for a cheap and cheerful 
noise analyzer, then the buffer amp would be a separate module.



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