EMRFD Message Archive 9702

Message	Date	From	Subject
9702	2014-02-09 17:56:10	Richard Johnson	Noise generator
Hello: If you have a spectrum analyzer but no tracking generator can you tune filters by passing broadband noise through the filter and observing the spectrum while tuning? What are the trade offs with this technique? Thanks for the help. rich
9703	2014-02-09 18:43:22	ashhar_farhan	Re: Noise generator
I tired this. The zener noise has a very unstable amplitude across the spectrum. You need to measure the filters against a reference that was hard to establish. - f Sent from BlackBerry® on Airtel
9704	2014-02-10 09:50:36	Sandeep Lohia	Re: Noise generator
Hi Group, M new here, & this my first mail a zener source of noise (though unstable amplitude) seems economic to me in time domain (something every one can have) Richard no fancy setup here, but brought a RTL -SDR to read strength of that filtered noise, for lower spectrum I already have some sample & hold... On 10/02/2014, farhanbox@gmail.com <farhanbox@gmail.com> wrote: > I tired this. The zener noise has a very unstable amplitude across the > spectrum. You need to measure the filters against a reference that was hard > to establish. > > - f > Sent from BlackBerry® on Airtel > > -----Original Message----- >
9705	2014-02-10 09:51:46	Sandeep Lohia	Re: Noise generator
Hi Group, M new here, & this being my first mail a zener source of noise (though unstable amplitude) seems economic to me in time respect domain (something every one can have) Richard no fancy setup here, but brought a RTL -SDR, also on the way to up converter as to read signal strength of that filtered/unfilterd noise, for lower spectrum I already have some homebrewed sample & hold... in past I tried homebrewed (DR2E) as to check spurs (unwanted noise) of DDS AD98xx series & it worked great. -- -- Please encourage recycling, reuse or repairing of E-waste. ░7░3░ ░d░e░ ░V░U░3░S░X░T░