AM/FM/FM-Stereo: Interference susceptibility measurements were made on 20 combination AM and FM stereo receivers (Donaldson et al., 1974b). These receivers were typical consumer units including both portable and console models. The test conditions were the same as described previously for TV. Interference thresholds that were measured at 3.1 to 3.5 GHz are: All of these interference thresholds are due to high power effects since the AM and FM receivers do not have any significant spurious responses at 3.1 to 3.5 GHz. The values of p and q required to produce spurious responses at these frequencies would be too large to be a significant factor in this situation. Also no significant spurious responses are anticipated at 2.45 GHz since values of p > 20 are required in order to satisfy the spurious response equation. Some improvements in the susceptibility of the these receivers were obtained by improving the shielding effectiveness of the receiver cabinets, increasing the power line filtering, and by filtering and shielding the antenna input leads. These improvements were typically of the order of 2 to 17 dB. VHF FM mobile transceiver: In these tests, a single FM mobile transceiver unit and two handheld portables were subjected to the interfering microwave fields (Jenkins et al., 1973a). These sets are solid state and are typical of the 164 MHz communication equipment used in commercial, VHF land mobile radio. Interference thresholds observed during the tests are: These thresholds are also all high power thresholds. The receivers do not have significant spurious response characteristics at 3.1 to 3.5 GHz. Electronic calculator: The susceptibility of a single programmable calculator was also tested at Georgia Institute of Technology (Jenkins et al., 1973b). The
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