[time-nuts] Phase noise measurement (was - no subject)

[Bob Camp]

Hi

There are a number of articles on the web detailing the art of getting one of these to work. Since it's broad band feedback you need to be a little careful with the layout and the transformer.

Bob



On Aug 21, 2010, at 2:50 PM, "Mark J. Blair" <nf6x at nf6x.net> wrote:

> 
> On Aug 21, 2010, at 11:30 AM, Bob Camp wrote:
>> I suspect you will have to hand wind the magnetics.
> 
> Ah, bummer. I thought that the two 1:5 transformers specified in the patent might be realized with this part for an amplifier for use at 10 MHz only:
> 
> http://minicircuits.com/pdfs/TT25-1.pdf
> 
> However, I got the feeling that autotransformer L1 might need some odd turns ratio to get the impedance matching right.
> 
> Am I anywhere close to making sense, or am I still droolingly clueless? :)
> 
> 
>> The 5109 was still in production last time I shopped for them.
> 
> I didn't find them at Digi-Key, but I just looked at Mouser and found them still available, made by Central Semiconductor:
> 
> http://www.centralsemi.com/PDFs/products/2n5109.pdf
> 
> I'm so accustomed to tiny surface-mount stuff in my day job, that I'm always surprised to find anything through-hole still in production!
> 
> -- 
> Mark J. Blair, NF6X <nf6x at nf6x.net>
> Web page: http://www.nf6x.net/
> GnuPG public key available from my web page.
> 
> 
> 
> 
> 
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