[time-nuts] Close in phase noise of microwave VCOs

Bob Camp kb8tq at n1k.org
Thu Jun 18 06:46:40 EDT 2015


Hi

Be careful when you do find the data.

When you go very close in on something like a VCO, you get much higher phase noise
than we normally worry about. Some of the “assumptions” that underly the measurements
are no longer true. Small angle of modulation is one, but there are a few others. A simple
“plug it in and read it” may not give you valid information without some corrections.  Coming
up with a supply that’s good enough (at 1 Hz) would be a major challenge ...

Bob


> On Jun 17, 2015, at 11:23 PM, Jim Lux <jimlux at earthlink.net> wrote:
> 
> On 6/17/15 1:08 PM, Magnus Danielson wrote:
>> Jim,
>> 
>> John Miles have been a bit active:
>> http://www.ke5fx.com/brick/brick.htm
>> 
>> Just to give you a start-sample.
>> 
> 
> those seemed to be all PLL outputs.. I didn't see the bare VCO data.
> 
> And, I'm really interested in the 1 Hz to 100 Hz kind of range.
> 
> 
> 
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