Hi All, At this time i am thinking is the dc offset, which i tried to set up for my db LFRX, useful ? Or is it useful to disable the automatically dc offset loop ? The dc offset changes every time depending on the temperatur and the decimation and maybe other factors !? So is the use of LFRX useful for measurement device ? I want to measure some unknown peaks from dc to 1.5MHz, with a gnuradio peak detector. My big Problem is the unknown peak in the middle of my FFT-Plot, which also may influence my Measurement ? Any comments ? Regards Markus
on 2009-03-31 17:51
on 2009-04-01 11:47
feldmaus <feldmann_markus <at> gmx.de> writes: > Any comments ? > I noticed that the dc offset changes if i change the frequency forward and then back to last frequency. Will the automatic dc loop enabled if i change the frequency ? Regards Markus
on 2009-04-01 12:02
feldmaus <feldmann_markus <at> gmx.de> writes: > Any comments ? > I also noticed the dc offset, which is needed, changes from signal generator to signal generator. Could this be true ? How to avoid this ? Regards Markus
on 2009-04-01 17:10
"feldmaus" <email@example.com> wrote: > I also noticed the dc offset, which is needed, changes from > signal generator to signal generator. > Could this be true ? > How to avoid this ? With the LFRX, the DC offset will depend on the DC resistance of your signal source. You need 50 ohms (at DC) on the input to get (approximately) zero offset. -- Don W.