FCC Method of Moments - SBE Chapter 24

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Modeling NEC Model – Mathematical description <strong>of</strong> array – Excite each tower, “float” all others – Create a tower array impedance matrix Physical Array – Measure each tower, “float” all others – Characterize any extra “stuff” “Massage” the Model
Example GEOMETRY Wire coordinates in degrees; other dimensions in meters Environment: perfect ground wire caps Distance Angle Z radius segs 1 none 0 0 0 .29 10 0 0 84.6 2 none 181.2 120.2 0 .29 10 181.2 120.2 84.6 3 none 366.4 116.6 0 .29 10 366.4 116.6 84.6 4 none 123.8 213.6 0 .29 10 123.8 213.6 84.6 5 none 201.7 144.9 0 .29 10 201.7 144.9 84.6 6 none 375.6 130.1 0 .29 10 375.6 130.1 84.6 7 none 90. 176.7 0 .29 10 90. 176.7 84.6
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: Back to “The Task” FCC Method o
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 and 40: Modeling Pattern Shape Defined by F
Page 41 and 42: Modeling Credit to Jerry Westburg:
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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