| 摘要 |
<p>The apparatus is aimed at radio receivers on board vehicles in movement along a highway without changes in tuning, and comprises: a plurality of emitting antennae (12, 14) arranged at intervals along said highway, and respective radio-frequency amplifiers (36, 42) connected to feed said antennae; an optical fiber line (18) adjacent to said highway, fed at one end by an optical transmitter (28) driven by a radio-frequency signal to be broadcast; means (30, 38) for tapping the radio-frequency signal from the optical fiber line at each radio-frequency amplifier; and delay means (34, 40) for delaying the radio-frequency signal having their input connected to the output of said tapping means and their output connected to said radio-frequency amplifiers; the delay introduced by each of said delay means being such that in the equisignal region between every two adjacent emitting antennae the broadcast signal is substantially coherent.</p> |
