parser.add_option ("-f", "--rf-freq", type="eng_float", default=None,
help="set RF center frequency to FREQ")
parser.add_option ("-i", "--interp", type="int", default=64,
parser.add_option ("-f", "--rf-freq", type="eng_float", default=None,
help="set RF center frequency to FREQ")
parser.add_option ("-i", "--interp", type="int", default=64,