case is a conventional TV receiver, which has a spurious relationship between certain UHF channels and the SPS frequency assignment. This type of interference is highly frequency dependent in that a frequency difference of a few megahertz can significantly affect the interference. With television, a change in frequency of only 6 MHz in either the victim or interferer can produce large changes in interference characteristics. Examples of both of these interference mechanisms can be seen in the following discussion. Television: The sample of home television receivers that was tested by Georgia Institute of Technology contained 45 tube and solid state, home type, television sets (Donaldson and Jenkins, 1974a). These sets were subjected to the 420 to 450 MHz and 3.1 to 3.5 GHz interference field for a variety of test conditions such as different channel tuning, control setting, and desired signal level. Orientation of the TV set relative to the interference field was a particularly important parameter since rf leakage is dependent on alignment of chassis openings and wires within the interference field. Values reported in the following are the worst case interference thresholds that were measured during the most susceptible combinations of control settings and set orientation. The range of values denotes the variability over the different sets. Threshold values observed are: A spurious response in a single conversion receiver, such as a TV receiver, is due to the nonlinear mixing of the interferer and local oscillator signals and occurs at a frequency of 3.1 to 3.5 GHz tests where the interference frequency is not a spurious response of the television frequency tests where the interference frequency is a spurious response of the television frequency 420 to 450 MHz tests where the interference frequency is not a spurious response of the television frequency tests where the interference frequency is a spurious response of the television frequency
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