[time-nuts] Low noise quartz crystal oscillator by Bruce Griffiths

[KA2WEU at aol.com]

This oscillator seems to have been more a frequency standard then a noise  
standard. Today's 10 MHz oscillators are different/better, such a crystal is 
no  longer available/made.
 
I have more experience with 100 MHz, 125 and 128 MHz. Once I am back in the 
 USA  I will send some measured results and comments. 
 
Thank for this reference :
 
http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1981-03.pdf
 
Ulrich 
 
 
In a message dated 10/28/2015 7:01:16 P.M. W. Europe Standard Time,  
hmurray at megapathdsl.net writes:


richard at karlquist.com said:
> The 2N5179 in the 10811 is  selected for minimum beta and Ft at 20 mA, 
which
> is the start up  condition due to the ALC being at full gain.  It has a
> special HP  part number, so you wouldn't know this just looking at the 
parts
> list.  

How much of a difference does that selection step make?

I'd  expect the parts within a batch to be very similar, more so for mature 
 
parts.


-- 
These are my opinions.  I hate  spam.



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