| 摘要 |
<p>A device for interspersing first and second intermittent r.f. signals to form a single output signal, comprising a directional coupler, means for applying the first signal to a first port of the coupler, and means for dividing the second signal into two and for applying the divided signal in quadrature to two other ports of the coupler, such that substantially all the input power appears at the fourth port of the coupler. A television transmitter, comprising in the vision modulated r.f. signal amplification stage means for separating the picture and synchronisation pulse elements of said signal, separate amplifiers for the separated elements of the signal, and a signal combiner for recombining the amplified separated elements.</p> |
