| 摘要 |
<p>1. Television transmitter comprising a device for switching two very high frequency channels one of which is fed by an internal frequency synthesizer (1) of the transmitter piloting the entire transmitter equipment and the other of which is permanently fed by an internal pilot (9) of the transmitter, characterized in that the switching device comprises : an automatic detection circuit (6) for detecting an eventual failure of the synthesizer and first (4) and second (10) electronic interrupters having a very high impedance when they are open, respectively connected in series with the two channels for disconnecting the synthesizer and connecting the pilot in function of the value of the output signal of the detection circuit.</p> |
