filename = "capture.raw"

Fc = 462.4e6    # Center frequency
Fs = 2e6        # Sample rate

N = int(2 * Fs) # Pull in this many samples
gain = 20.0     # Gain

dirname = "/home/jbm/"

from rtlsdr import RtlSdr
%pylab inline


sdr = RtlSdr()
    
# configure device
sdr.sample_rate = Fs  # Hz
sdr.center_freq = Fc     # Hz
sdr.freq_correction = -52   # PPM
sdr.gain = gain

# Read samples
x = sdr.read_samples(N)
sdr.close()
del(sdr)

todump = np.array(x).astype("complex64")
todump.tofile(dirname + "/" + filename)

psd(x)

len(x)

Populating the interactive namespace from numpy and matplotlib

4000000