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

Brooke Clarke brooke at pacific.net
Thu Jun 18 14:47:19 EDT 2015


Hi Bob:

The DC supply in the HP 4352 VCO test set is very special in that it's output voltage has extremely low noise.
Another option is to use a battery(s) for the control voltage.

Mail_Attachment --
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Bob Camp wrote:
> 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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