Abstract: A base plater or a vacuum deposition apparatus 24 having individually and selectively controlled work holders 10 and a capactively coupled crystal monitor 26. A flipping control mechanism 31 individually and selectively controls flipping of each of the work holders 10 by selectively engaging a flip lever 32 to a flip gear 14 of each work holder 10. The flipping control mechanism 31 allows individual and selective rotation of the work holders 10 to plating and non-plating positions for particular plating processes or runs. Rings 28, 36, 40, and 42 are used to provide a generally open central area 60 that is generally free from obstructions that may adversely affect the plating process and/or the surface or components of the base plater apparatus 24. A crystal monitor 26 is mounted to rotational ring 28 which is in the same rotational plane and periphery of the work holders 10.

Abstract: An intrusion detection system includes a transmitter coupled to one end of a coaxial cable, a plurality of antennas spaced along and loosely coupled to the cable, and a receiver circuit coupled to the opposite end of the cable, the antennas being aimed at a protected region. The transmitter transmits microwave energy along the cable. A portion of the energy is transmitted by each antenna into the protected region and is reflected by a moving intruder or target back to one of the antennas. The receiver circuit imposes a low frequency square wave signal on the center conductor of the cable. A diode is attached across the two radiating elements of each antenna. The square wave on the center conductor forward biases the diode and thereby shorts each antenna for half of each low frequency cycle, resulting in chopping of the received signals from each antenna.