<!-- transponder parameters:
bandwidth: 0 = 8 MHz, 1 = 7 MHz, 2 = 6 MHz, 3 = Auto (unsupported, default)
constellation: 0 = QPSK, 1 = 16-QAM (default), 2 = 64-QAM, 3 = Auto
code_rate_{lp,hp}: 0 = 1/2, 1 = 2/3, 2 = 3/4, 3 = 5/6, 4 = 7/8, 5 = Auto (default), 6 = None
guard_interval: 0 = 1/32, 1 = 1/16, 2 = 1/8, 3 = 1/4, 4 = Auto (default)
transmission_mode: 0 = 2K, 1 = 8K, 2 = Auto (default)
hierarchy_information: 0 = None, 1 = 1, 2 = 2, 3 = 4, 4 = Auto (default)
inversion: 0 = Off, 1 = On, 2 = Auto (default)
-->