Omega Hawaii Antenna System: Modification and Validation Tests. Volume 1. Report Proper

摘要

Electronic measurements were performed on the Hawaii Omega Antenna System during the months of May and June 1978 and March and May 1979. The work was performed under NOSC project MP01538B10 with Megatek as contractor. The electrical height of the antenna is 169 metres for all frequencies. The station can easily radiate more than 10 kW on all frequencies. There is no measurable deviation from omnidirectional radiation due to the proximity of the Haiku Valley walls to the south, west and north of the antenna. The apparent capacitance of the antenna was measured. Also, the inductance of the spare variometer and its variation was measured. From these preliminary measurements, the optimum location of the 11.050 kHz helix tap was determined and connected. The value of the antenna system's resistance was measured on three days of different weather conditions and found to vary. This variation is related to the degree of salt deposit on the antenna insulators. A recommended set of gear ratios for the variometer gear boxes is determined. (Author)