unit tested was a self-contained calculator that could be programmed from a keyboard or cassette magnetic tape. Alpha numeric output from the calculator was through an external electronic printer which was also included in the tests. The minimum interference threshold for this device was: CATV distribution system: Community antenna television (CATV) systems were also tested (Jenkins et al., 1973b). For these tests, equipment typical of such an installation was tested in the 3.1 to 3.5 GHz microwave interference described previously (ibid). Although it is probably not beneficial to describe the equipment tested in any detail, a brief listing of the equipment will be given in order to give the reader a feel for the scope of the problem. The "head-end" equipment tested consisted of a rack of equipment normally used in community cable installation. This rack of equipment contained: Channel 4 preamplifier Channel 8 preamolifier Channel 12 preamplifier Preamplifier power supply Signal processor channel 4 to 4 Signal processor channel 8 to 6 Signal processor channel 12 to 10 Band pass filters channels 4, 6, and 10 Combining networks channels 6 and 8 AGC pilot tone generator. Also included in the tests were six different types of line amplifiers that are also normally found along a typical cable network. The range of interference thresholds that were measured during these tests is: Analysis of the tests showed that the head-end system was the part of the system most susceptible to interference. Television camera and video tape recorder: Susceptibility tests were also conducted on a black and white television camera and a video tape recorder (ibid) . The two units were conventional 525 line, consumer type of TV components. Security cameras with environmental housings are discussed later in this report. Interference thresholds at 3.1 to 3.5 GHz are;
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