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 Mail Address: Lester Veenstra Dawn Cottage Norwood, Harrogate HG3 1SD UK Lester Veenstra PSC 45 Box 781 APO AE 09468 Telephones: Office 940-6456 Office +44-(0)1423-846-385 Home: +44-(0)1943-880-963 UK Cell: +44-(0)7716-298-224 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <time-nuts@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 > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
