A tuner receives an input signal in which a high bandwidth video data stream is multiplexed amongst multiple fixed-bandwidth channels. The tuner receives instructions to output the high bandwidth video data stream and tunes and demodulates the input signal for the multiple fixed-bandwidth carriers in parallel. The tuner can apply error correction to the demodulated signal and identify data packets associated with the high bandwidth video data stream. The tuner combines the identified data packets to recover the original high bandwidth video data stream and outputs the high bandwidth video data stream via a universal serial bus port. As such, the tuner can be connected to a legacy receiver unit as an external module that enables the legacy receiver unit to receive high bandwidth video data streams that are multiplexed amongst multiple fixed-bandwidth channels.