[time-nuts] External clock for Analog to DigitalConverter inGPS Rx front-end

[Lester Veenstra M0YCM]

Another tried and true, particularly for those of use who collect old
modular amps from junque s a noise source made from nothing than the gain of
a series of amplifiers strung together.  Then amplify the KTB input noise of
the first unit until you have what you need. Bandlimited to the amps BW, but
it's cheep!

Lester B Veenstra 
M0YCM  K1YCM  M0YCM/6Y5  K1YCM/6Y5
 
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-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Bilal Amin
Sent: Saturday, March 03, 2007 1:29 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] External clock for Analog to DigitalConverter inGPS
Rx front-end

Thank you Bruce, this is indeed very useful.

Regards

Bilal
----- Original Message ----- 
From: "Dr Bruce Griffiths" <bruce.griffiths at xtra.co.nz>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Saturday, March 03, 2007 5:10 PM
Subject: Re: [time-nuts] External clock for Analog to Digital Converter 
inGPS Rx front-end


> Bilal Amin wrote:
>>> Hi John and Bruce,
>>>
>>> Thank you for your ideas. Now I have a much better picture for the
>>> experiment using the comparator. Now, my only concern is a noise 
>>> generator.
>>> I have searched and found out that all the commercially available now
>>> generators are very expensive and some what out of my price range.
>>> What would you guys suggest for a noise generator? Do you think 
>>> generating
>>> noise using a zener diode circuit is a good idea? Or any cheap noise
>>> generators are available in the market. Any one has any experience? As I

>>> am
>>> working in 8Ms/s zone, therefore the noise generator should be of high
>>> specs.
>>> I have a signal generator (Agilent Tech. 8648A). I can use the PM option

>>> in
>>> this signal generator to get the results, but again the only problem is 
>>> a
>>> noise generator which I can use at the modulating input of the signal
>>> generator to modulate the RF signal.
>>>
>>> Cheers
>>>
>>> Bilal
>>>
>>>
> Bilal
>
> You may also want to look at:
>
> http://pdfserv.maxim-ic.com/en/an/AN3469.pdf
>
> Bruce
>
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