Hello everyone, I am new to GNU Radio and the USRP2, but I have been playing around and have successfully made a FM receiver. I have a few questions:
1) When I am receiving AM radio frequencies and demodulating them with the AM demod block I get no audio period, no static, nothing. The only thing I get is clicking when I try to up the volume to a point past what the sound card can play. Is there something silly I am missing that isn't allowing me to hear the AM radio: here is my block diagram:
USRP2 Source ==> Throttle to 250k ==> Low Pass Filter (Decimation of 5 and a variable cutoff and width) ==> Rational Resampler (Decimation: 500, Interpolation 441) ==> AGC2 (Attack Rate: 100m, Decay Rate: 10u, Reference: 900m, Gain & Max Gain: 1) ==> Am Demod (Channel Rate 44.1k, Audio pass: 5k, Audio stop: 5.5k) ==> Multiply Const (volume adjust) ==> Audio Sink (Sample rate: 44.1kHz)
2) I am intending to build a setup that includes a headless computer and the USRP2 packaged together, when looking at PCs what gigabit ethernet cards are supported (or is it any supported by the linux kernel), and if the clock speeds on the computer (in the buses, cpu, etc.) are as fast as or faster than the clock speed of the USRP2 I shouldn't run into any trouble processing the data, correct? I only ask to make sure before I order the computer.