Hi,
I'm trying to figure out an impedance problem with my USRP/LFRX system. I am
using the LFRX daughtercard to measure background noise from a hydrophone
(underwater microphone). I am using a +40dB gain preamplifier to amplify the
signal from the hydrophone and then I feed it into the LFRX
What is the output impedance of your preamplifier? I do similar data
acquisition with the LFRX and I pass my signals through an op-amp
buffer and through a 50ohm series resistor at the output so I get a
gain of 0.5. That has always worked for me.
You could test this out by hooking up a signal
