hi tom, if you are using casper adcs:
all the casper adc boards are AC coupled (they have baluns and coupling capacitors), so even if your input signal has a DC offset, it won't couple into the ADC. however, there are slight DC offsets in the ADC, so there will be a small spike in the DC bin, but probably not from the signal your are injecting. best wishes, dan On Fri, Apr 24, 2015 at 4:38 PM, Kuiper, Thomas (3266) <[email protected]> wrote: > I think they do but am not sure. I didn't have time to download firmware > from JPL (I'm in Canberra) to get actual data samples. We shoved the > signal into a DSN data processor. It has a display, reports rms but no > mean. (After all, RF data is always zero mean, right?) I'm wondering > about the fiber-optic links. You have some experience with that. > > Tom > ________________________________________ > From: G Jones [[email protected]] > Sent: Friday, April 24, 2015 4:34 PM > To: Kuiper, Thomas (3266) > Cc: Casper Lists > Subject: Re: [casper] Skewed data samples > > Hi Tom, > Wouldn't that just cause extra power in the DC bin? Or do the samples > still have zero mean? > > Glenn > > On Fri, Apr 24, 2015 at 7:32 PM, Kuiper, Thomas (3266) < > [email protected]<mailto:[email protected]>> wrote: > Does any have an idea what might happen to a PFB if the data samples have > a slight skewness towards negative values? Maybe someone has the answer > before I start modeling. > > Thank > > Tom > > >
