| 摘要 |
<p>An improved remote control system adapted for use with consumer appliances and the like and having improved frequency stability and relatively low cost comprises a ceramic-stabilized r.f. hand-held remote transmitter unit operating in conjunction with a ceramic-stabilized r.f. receiver unit (50) located within the appliance to be remotely controlled. The hand-held transmitter unit includes a negative resistance oscillator which comprises a ceramic resonator and an associated active element and is linked through a suitable matching network to a loop antenna for broadcasting r.f. signals therefrom. Modulation of r.f. signals at the oscillator is accomplished by ON-OFF keying of a switch linked to the oscillator. The remote receiver unit (50) includes an antenna (52) for receiving the broadcast r.f. signals and an associated isolation amplifier (54) for improving signal spectrum radiation and increasing power gain. The remote receiver unit (50) is implemented in the form of a super-regenerative receiver using a self-quenched r.f. oscillator (56) in which the frequency reference is derived from a ceramic resonator tuned to the reference frequency in the transmitter unit.</p> |
