Abstract: An RF repeater for receiving and retransmitting video composite signals, especially wherein the signals of different channels are spectrally adjacent includes discrete aural and visual stages for separating the composite video signal into its components. The aural stage includes a phased locked loop filter while the visual stage may use a SAW filter. After separation and amplification, the two signals are up-converted and combined for retransmission. The visual stage also includes a phase locked loop for synthesizing a local oscillatoar signal and for phase lock detection.

Abstract: An S-Band video transmitter includes a modulator, an up converter for converting the modulated signals to a preselected S-band, and transmit circuitry for transmit circuitry for transmitting the RF signals. The S-band frequency is selected by a synthesizer including a digital phase locked loop in accordance with an input frequency selection signals.

Abstract: A portable TV transmitter is provided on a harness. The transmitter may be carried by a person on the back thus leaving the hands free for operating a TV camera coupled with the transmitter. The transmitter is equipped with a multi-directional antenna, a rechargeable battery pack and a battery charger. The battery pack and charger may be removed during the charging operation.

Abstract: A band-reject filter comprises a resonator with an adjustable resonator rod which is mounted in proximity to a co-axial assembly. The coupling rod passes thru the inner conductor of the co-axial assembly and extends into the resonator. At the end of the rod inside the resonator there is a coupling disc. Means are provided to adjust the distance between the resonator rod and the disc. The frequency rejected by the filter can be adjusted by either adjusting the length of the resonator rod or by adjusting the distance between the disc and the resonator rod.