 The B-Band Converter (BBC) is also not required with the new Single Wire Multiswitch (SWM or SWiM) system, which preselects the satellite and transponder tuning and can feed up to 8 tuners via a single coaxial cable.The "HR" moniker designates the receiver as an HD digital video recorder (DVR) model.Only the H20/HR20 support direct reception of over-the-air ATSC broadcasts.