[time-nuts] GPS and Rubidium frequency standards and noisequestion (new...
Bob Camp
lists at rtty.us
Tue Jun 5 13:08:58 UTC 2012
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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