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THIS PAGE IS UNCLASSIFIED 1. QUESTIONS REASONING DEFRAITING RADAR EQUIPMENT 1. What type radar equipment is involved? AIX/TPG-3 Search Radar 2. Has there been any recent maintenance difficulties? If so, describe. Negative 3. What type oscillator (i.e., spark gap, hard tube, etc.) is used in the radar equipment? Hydrogen Thyratron (hard tube) 4. Was the AIC (automatic frequency control) circuit of the receiver operating properly? Yes - in auto position 5. Has interference from another radar set been observed recently, and are personnel familiar with the effects caused by an interfering signal? Some observed, and personnel are familiar with adjacent station interfering 6. What type indicators, “A scope”, “B scope”, etc., were used to follow the target? PFI Scope 7. What was the radar scan rate? 3.3 AIX 8. What was the approximate frequency of the transmitter? 1290 MHz II. GENERAL QUESTIONS 1. What were the renal weather conditions at the time unidentified target was observed? Ⅰ 2. What weather data from nearby U.S. weather stations is available on temperature vs altitude, humidity vs altitude, and wind velocity vs altitude? Ⅰ 3. Are the target observed by any other nearby radar equipments? If no, give details. No 4. Are the operator and the supervisor familiar with the effects of anomalous (duct-effect) propagation as they pertain to this type radar? Ⅰ
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