Abstract: An Electronic Isolation Chamber With Unimpeded Hand Entry is disclosed. The somewhat “open” appearance of the Electromagnetic Isolation Chamber goes contrary to teachings in the art of RF shielding and enclosures. A sleeve through an aperture in the chamber is worn by an operator, and with the placement of an operator's arm there through, the electromagnetic shielding is completed and the volume contained within the chamber is electromagnetically isolated from the environment exterior to the chamber. This novel arrangement allows an operator to work with bare hands, thus providing more tactile interaction with a device under test and also reducing the tendency for shorting that is present when wearing conductive gloves. A shielded window and an interior light may be included to facilitate viewing of a device within the chamber during operation of the device.

Abstract: An Electronic Isolation Chamber With Unimpeded Hand Entry is disclosed. The somewhat “open” appearance of the Electromagnetic Isolation Chamber goes contrary to teachings in the art of RF shielding and enclosures. A sleeve through an aperture in the chamber is worn by an operator, and with the placement of an operator's arm there through, the electromagnetic shielding is completed and the volume contained within the chamber is electromagnetically isolated from the environment exterior to the chamber. This novel arrangement allows an operator to work with bare hands, thus providing more tactile interaction with a device under test and also reducing the tendency for shorting that is present when wearing conductive gloves. A shielded window and an interior light may be included to facilitate viewing of a device within the chamber during operation of the device.

Abstract: A system for sensitively discriminating against background radiation which tends to swamp and prevent detection of radiation from a source of interest such as IR (Infra-Red) light radiation as may be found on “low observable” aircraft collision avoidance lighting, utilizes the modulation of such radiation as a mechanism for tracking the radiation and discriminating against the background radiation, for example, from other light energy sources.

Abstract: A glove box enclosing a volume shielded from electromagnetic radiation by the glove box wherein the gloves are formed from conductive material such as chain mail and are conductively and shieldingly attached around apertures in the walls of the glove box, permitting an operator to manipulate directly a device under test within the glove box while maintaining the shielding continuity of the box. A shielded window and an interior light can be included to facilitate viewing of a device within the box during manipulation of the device. The glove box provides an inexpensive, fully-shielded environment for the testing, tuning, adjusting, or repair of RF transmitting or receiving devices such as pagers, electronic notebooks, and cellular telephones.

Abstract: A broadband radio receiver monitors transmissions over a broadband of frequencies, and especially over the aircraft band, between aircraft and control towers or between the cockpit and ground stations at an airport. The radio utilizes an earphone having a lead which provides an antenna. The lead is AC coupled to an amplifier having band-pass filters connected to the input and to output thereof to provide selectivity while passing the entire band. An AM detector is connected to the output filter and produces an audio signal which is coupled, via an RF blocking inductor, to the earphone by way of the earphone lead. A miniaturized self-contained radio is therefore provided which does not utilize a local oscillator or other radiating signal generator and may be used on board or nearby aircraft without violating regulations for the use of electronic equipment.