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:
- 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)
- 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.