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Transcript
WLCM Nighttime Array at Holt, MI The Christian Broadcasting System of Fenton, MI, employed the firm of Munn-Reese, Inc. for the design and tune up of is new nighttime facility at Holt, MI. The new 4 tower directional array provided a large power increase from the previously allowed 70 watts nighttime to the new 4.5 kW of nighttime coverage over Lansing, MI. The new phasor was designed and built by Kintronic Labs and used the recently developed technique of not returning the negative tower back to the power buss in the phasor but instead dumping the returned energy into a dummy load. The power of the transmitter was them increased to make up for the lost power dissipated in the load. Keeping the negative tower off the phasor power buss flattened the match presented to the transmitter and increased the over all bandwidth of the array. This bandwidth increasing technique requires the use of dual Delta meters. One Delta Meter to measure the power in the reject load and the other to monitor power from the transmitter. Both currents are monitored by the remote control and power is adjusted accordingly. The array was adjusted, field tuned and the proof of performance was completed by the Munn-Reese, Inc. engineers mid November 2008. The FCC granted program test Christmas Eve, December 24, 2008. Exhibit 11.3 Horizontal Plat of Antenna Array Tower 1 North Extent of Ground System 89.0° Electrical spacing 174.9 feet (53.3 m) 184.0° True Tower 2 180.0° Electrical spacing 353.8 feet (107.8 m) 184.0° True Transverse Copper Straps Tower 3 298° Electrical spacing 585.7 feet (178.5 m) 186.0° True Tower 4 The proposed ground system consists of 120 buried copper radials, extending 53.9 meters in length, about the base of the towers except where shortened to terminate at property boundaries. The material used for the radials will be #10 AWG, soft drawn copper wire Exhibit 9.0 Nighttime Directional Radiation Pattern 0° 340° 350° 2000 10° 20° 30° 330° 40° 320° 1500 50° 310° 300° 60° 1000 70° 290° 500 280° 80° 270° 90° 0 260° 100° 250° 110° 240° 120° 130° 230° 140° 220° 150° 210° 200° Measurements in mV/m 190° 180° Call: WLCM Freq: 1390 kHz Hours: Night Lat: 42-33-07 N Power: 4.5 kW Theo RMS: 740.41 mV/m @ 1km @ 4.5 kW # -1 2 3 4 Field Ratio ----0.521 1.000 0.849 0.374 170° 160° Measured Pattern: ▬▬▬▬ Standard Pattern: ▬▬▬▬ Meas. Pattern x 10: ▬ ▬ ▬ Stand. Pattern x10: ▬ ▬ ▬ HOLT, MI, US Lng: 084-33-05 W Phase Spacing Orient Height Ref TL A B C D (deg) (deg) (deg) (deg) Swtch Swtch (deg) (deg) (deg) (deg) ----------------- ----- ----- ----- ----- ----- -----145.1 0.0 0.0 93.0 0 0 0.0 0.0 0.0 0.0 0.0 89.0 184.0 93.0 0 0 0.0 0.0 0.0 0.0 142.8 180.0 184.0 93.0 0 0 0.0 0.0 0.0 0.0 -84.7 298.0 186.0 99.0 0 0 0.0 0.0 0.0 0.0 ---------------------------------------MUNN–REESE, INC. Engineering Consultants Theoretical RMS: 740.41Broadcast mV/m@1km Erss = 1149.96 mV/m@1km Coldwater, MI 49036 Q = Standard RMS: 778.02 mV/m@1km 28.75 mV/m@1km