FCC Method of Moments - SBE Chapter 24

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Modeling Measuring the Tower Field is Difficult – As with NDA, measure currents, however… Establishing Tower Drive Impedances in Directionals is Very Difficult Impedance is really “Volts-per-Ampere” – Tower drive impedance is a summation – Self-impedance plus other “volts-per-ampere”
Modeling Credit to Jerry Westburg: – “Matrix <strong>Method</strong> for Relating Base Current Ratios to Field Ratios <strong>of</strong> AM Directionals” – IEEE Trans. On Bcstg. V 35 #2, June, 1989 Calculate Drive Impedances and Currents – Verified NEC mathematical model – Field ratios from construction permit
Page 1 and 2: FCC Method of Moments Licensing AM
Page 3 and 4: Classic AM “Proof” Construction
Page 5 and 6: Classic “AM “ Proof Pattern Sha
Page 7 and 8: Could This Cumbersome Process be Im
Page 9 and 10: “Method of Moments” Applicable
Page 11 and 12: “Method of Moments” In Plain En
Page 13 and 14: “Method of Moments” NEC Modeled
Page 15 and 16: “Method of Moments” NEC Modeled
Page 17 and 18: )cos cos (1 cos ) sin cos( ) ( G G
Page 19 and 20: NDA Base Impedance Determined by: -
Page 21 and 22: Back to “The Task” FCC Method o
Page 23 and 24: Example GEOMETRY Wire coordinates i
Page 25 and 26: Example IMPEDANCE normalization = 5
Page 27 and 28: Verifying the Model With Series Ind
Page 29 and 30: Example GEOMETRY Wire coordinates i
Page 31 and 32: Example Lumped loads resistance rea
Page 33 and 34: Verifying the Model Adjust Tower Im
Page 35 and 36: FCC Requirements - Tapered towers m
Page 37 and 38: Example Two turn lightning loops pl
Page 39: Modeling Pattern Shape Defined by F
Page 43 and 44: Example MEDIUM WAVE ARRAY SYNTHESIS
Page 45 and 46: Example C : \ D o c u m e n t s a n
Page 47 and 48: DA FCC “302” Location - from Su
Page 49 and 50: FCC Requirements Determining “Pro
Page 51 and 52: Sampling System The Sampling System
Page 53 and 54: Sample Lines Verifying Length and I
Page 55 and 56: Example Sample line measurements wi
Page 57 and 58: Toroid Verification Toroids R F Sou
Page 59 and 60: FCC Requirements - Sample line leng
Page 61 and 62: Maintenance At Least Once Every 24

FCC Method of Moments - SBE Chapter 24

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