Re: Spurs/Harmonics fixes for v4 based on v5 board design?
Bill Cromwell <wrcromwell@...>
Hi Jerry,toggle quoted messageShow quoted text
The work-around I saw was using a notch filter to reduce the carrier a specified or known amount. The idea being the carrier is reduced going into the SA but the harmonics are not. Obviously close-in spurs are attenuated too. So it's not good for measuring those unless they are really gross. Nothing is done to the ADC.
The trick is to assure we reduce the carrier without reducing any other part of the spectrum. A good spectrum analyzer with a tracking generator could do that. It would be needed each time the 'trick' was used and adjusted. We might be able to do that but it seems like more of a headache than it's worth. I would have trouble trusting the notch.
On 1/21/19 11:33 AM, Jerry Gaffke via Groups.Io wrote:
If anybody can remember more about this 40dB dynamic range get around, I'd be very curious.
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