[time-nuts] Advice on 10 MHz isolation/distribution (Clay)

Bob Camp lists at cq.nu
Fri Feb 19 00:11:34 UTC 2010


Hi

The reason to consider transformers is that they cut out 2/3 of the parts in the circuit and significantly reduce the noise.

Bob


On Feb 18, 2010, at 6:33 PM, life speed wrote:

> Message: 5
> Date: Thu, 18 Feb 2010 17:13:55 -0500
> From: "Bob Camp" <lists at cq.nu>
> Subject: Re: [time-nuts] Advice on 10 MHz isolation/distribution
>     (Clay)
> To: "'Discussion of precise time and frequency measurement'"
>     <time-nuts at febo.com>
> Message-ID: <13D264786A8A41E781BB4E53C1DD9A00 at vectron.com>
> Content-Type: text/plain;    charset="iso-8859-1"
> 
>> Hi
>> 
>> Have you looked into any actual data on small rf transformers under
>> vibration at 10 MHz? 
> 
> Hi,
> 
> No.  I have experience with low-noise designs under vibration, however.  What is the compelling reason for even considering such a device when a design is available that doesn't need it?  Sounds like risk without an upside to me.
> 
> 
>> The phase noise of your reference is going to head up by your +56 db. As
>> long as the transformer's impact is well below the reference, it will not
>> show up in the output signal.
> 
> any spur larger than -130 dBc will be an issue.  It doesn't take much vibe to do that.  And the synthesizer has to operate under 10g RMS.
> 
>> Noise at the load is a problem, no matter how it gets there. Transmission
>> may not be inside your scope -yet. It's still an issue that directly impacts
>> what you are trying to do.
> 
> Only one device is at the end of a long cable, with reduced performance expectations.  The others are local and share a common ground.
> 
> I am familiar with the various types of capacitors properties and frequencies.
> 
> Clay
> 
> 
> 
> 
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