Author Topic: Diy Noise Source up to 3GHz  (Read 10698 times)

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Offline PP2KR

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Re: Diy Noise Source up to 3GHz
« Reply #25 on: November 03, 2018, 02:49:57 am »
Hi all
Have a look of DF9IC's site: http://www.df9ic.de/doc/2014/mmrt_2014/mmrt14_CANFI.pdf at pag 20 also his CANFI http://www.canfi.eu/ is a nice design ;)

Kleibe
 

Offline BFX

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Re: Diy Noise Source up to 3GHz
« Reply #26 on: November 03, 2018, 08:25:22 pm »
If you've not already done so it's important to read this article by Franco Rota:

https://www.rf-microwave.com/app/resources/uploads/diodes/VHFComm_NW303.pdf

Here is more information and nice color pictures of the prototype and the final design.

www.eme2008.org/papers/Lab%20equipment/i5sxn_Noise%20generator.pdf

Franco presents some important information about the self resonance effects of SMD device orientation and the issue of enclosure resonances.

I'd like to have a precision noise source without having to spend $$$.

A question for EVS:  Would a precision current source flatten out the spectrum shown on the SA?  It seems to me that current variations during the sweep might account for some of the variation in apparent output.  Of course, averaging would eliminate those.  Could you show an expanded vertical scale with and without averaging?

Few years ago I bought that like a kit without enclosure. Very good.
Here is my finished head. It cost me around 100$.
   
 

Online Wolfgang

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Re: Diy Noise Source up to 3GHz
« Reply #27 on: November 03, 2018, 08:45:21 pm »
How flat is it over frequency ?
 


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