[time-nuts] 35601A as stand-in for 11848A ?
jmiles at pop.net
Sat Jan 5 19:57:47 EST 2008
While that makes sense as an optimization step, I think it's important not
to send him on an endless hunt for a few extra dBc/Hz' worth of accuracy
when he's missing 30 or 40. He can get to -160 dBc/Hz with only the
1980s-era guidelines in the HP and Wenzel app note, which are relatively
simple (if still error-prone when executed manually).
-- john, KE5FX
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Bruce Griffiths
> Sent: Saturday, January 05, 2008 4:51 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 35601A as stand-in for 11848A ?
> 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.
> > Bruce
> Correction #2
> 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.
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