[time-nuts] 35601A as stand-in for 11848A ?
bruce.griffiths at xtra.co.nz
Sat Jan 5 19:50:35 EST 2008
Bruce Griffiths wrote:
> Phase noise calibration standard.
> Oops, since the lower frequency limit of a hybrid combiner doesn't
> extend to dc (a low frequency limit of 2-4KHz is possible) a resistive
> power summing circuit would actually be required for low frequency offsets.
To evaluate the effect of the PLL its actually necessary to add the
gaussian noise to the output of one of the OCXO's in the stnadard PLL setup.
Using a single source to drive both mixer ports (with and without noise)
will not measure the effect of the PLL.
More information about the time-nuts