[time-nuts] GPS and Rubidium frequency standards and noisequestion (new...

[Bob Camp]

Hi

Put another way - nobody should directly multiply 10 MHz to 10 GHz with an
real expectation of low phase noise when they are done. The design of that
multiplier chain is a big part of the equipment design. Cheap out on it and
you will have trouble.

The same issues also get into high speed timing circuits. There the cause /
effect are not quite as obvious to people. It's a frequency domain / time
domain gotcha where the noise makes more sense in the frequency domain. 

Bob 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of EWKehren at aol.com
Sent: Tuesday, June 05, 2012 6:23 AM
To: time-nuts at febo.com
Subject: Re: [time-nuts] GPS and Rubidium frequency standards and
noisequestion (new...

Most Rb's can be improved when it comes to phase noise even a FRK-H, some  
by replacing the internal oscillators, some by adding an external analog 
loop.  How ever multiplying to 10 GHz and you have to contend with the 60 db

deterioration. One way around is higher frequency XTAL or SAW oscillator,
but 
 that is an off list discussion.
Bert Kehren
 
 
In a message dated 6/4/2012 11:35:15 P.M. Eastern Daylight Time,  
timt at skybase.net writes:

On  3/06/2012 7:19 PM, Javier Herrero wrote:

[snip]

>
> I  don't remember if someone did a comparison in PN performance between 
>  the two FE-5680A flavours.
>

Hi Javier,

I've recently done  precisily that. See enclosed graph.

As for using RB's and Tbolts for LO  locking of mwave synths, a lot of 
discussion and testing is occurring on  our VK logger, specifically at  
URL....

http://www.vklogger.com/forum/viewtopic.php?f=40&t=10180

and

http://www.vklogger.com/forum/viewtopic.php?f=40&t=10229

regards

Tim

--  
VK2XTT :: QF56if :: BMARC :: WIA :: AMSAT-VK ::  AMSAT



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