Nirali Patel wrote: > Hello everyone, > > I am a new user and recently set up the USRP and TV_RX boards to receive FM > radio and now trying to take the dive into capturing HDTV. I had a basic, > maybe dumb question on the presence of a low pass filter before the A/D > converter. Does anyone know if the TV_RX board has an anti-aliasing low pass > filter on it? Or within the Microtune 4937 tuner module? I looked at the > schematic for the daughter board and the data sheet for 4937 but I am not > sure if there is one. The TV_RX I got has an IF frequency of 44MHz and I > understand that undersampling it at 64 Msps with the A/D converter causes it > to fold to 20 MHz. I wanted to know whether there is or there needs to be a > low pass filter before the A/D converter to suppress any energy in the lower > frequencies before sampling. >
The output from the tuner module has already been filtered by a SAW filter, so there is no need for any further filtering. There is only significant energy in the desired band. Matt _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
