[time-nuts] State of the art of crystal oscillator measurements

[Richard (Rick) Karlquist]

Zo doesn't matter for these purposes.
dBm works just as well for 75 ohm systems.

On 8/11/2016 1:22 PM, John Miles wrote:
> Remember that L(f) is expressed in dBc/Hz, not dBm/Hz.  If it were dBm/Hz, then kT would be the limit.  But in dBc/Hz terms, the limit is 177 + the DUT's output power in dBm.
>
> Assuming a 50 ohm system, of course.
>
> -- john, KE5FX
> Miles Design LLC
>
>