 T10 and T11 use this 500 MHz of spectrum for yet more simple one-way broadcast HDTV.Since the 500 MHz frequency block (18.3-18.8 GHz) used by T10 and T11 on downlink were not intended for DBS broadcasting, existing equipment cannot receive them without a B-Band Converter (BBC).DirecTV supplies BBCs with all 5-LNB Ku/Ka-band dish systems.