EVALUATION OF ATCBI-3 TRANSMITTER MODIFICATIONS AND OMNI ANTENNA.
NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J
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The report describes modifications designed to introduce side-lobe suppression SLS features, improve the selection and interlacing of interrogation modes, add beacon-sync trigger and mode-trigger output capability, and provide the transmitter with additional pulse power capacity. Emphasis was given to comparison of the design requirements with the actual levels of interrogation-pulse and SLS-pulse power measured during instrumented flights within a representative beacon environment. It was concluded that the design requirements for the prototype modifications are generally valid as a basis for product specifications but must be refined so as to limit the attenuation of SLS pulses within the SLS Crystal Diode Switch. It was also concluded that the modification for additional transmitter power is not required. It was recommended that product specifications be based upon the design requirements along with the additional requirement that the modifications avoid attenuation of SLS pulses more than interrogation pulses. It was further recommended that the transmitter-pulse power amplifier be omitted from the standard modification but that provisions be made for adjustment of the ratio of interrogation-pulse power to SLS-pulse power, over a 3 dB range, when the modifications are installed in the field. Author
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