Tuners with high input impedance are connected to a common radio frequency
(RF) signal source. A termination load external to the tuners provides
matched impedance loading for the transmission line or cable driving the
tuners. Alternatively, the termination load can be located inside one
tuner with a switch to enable or disable the load. All tuners receive the
same signal and no signal degradation is caused when connecting multiple
tuners. The multiple tuner connection is useful in television signal
receiving devices that receive more than one independent channel, such as
digital video recorders or picture-in-picture television receivers.