I have my own RF front end i'm using with the USRP, but it requires a High impedance load to operate correctly. Since the basic RX daughterboard has a 50 ohm impedance, I have to modify it or add a separate voltage buffer before the input. However, since the basic RX daughter board in the USRP has an op-amp in its first stage, perhaps I could modify this.
I've tried removing R3 and R9 (http://code.ettus.com/redmine/ettus/documents/4), but this did not seem to load the RF front end sufficiently. Would changing the 348 ohm resistors to a higher value help increase the input impedance into the basic RX daughterboard? If so, how would this affect the output going into the A/D (besides the obvious filtering effects). -- View this message in context: http://old.nabble.com/Modify-the-Basic-RX-Daughterboard-tp32425579p32425579.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
