du Treil, Lundin & Rackley, Inc. Consulting Engineers REQUEST FOR APPROVAL OF SPECIFIED RADIATION EFFICIENCIES FOR VALCOM 85 FOOT POLE WITH VALCOSPHERE OVER THE RANGE OF 1200 KHZ TO 1390 KHZ AND VALCOM 75 FOOT POLE WITH VALCOSPHERE OVER THE RANGE OF 1390 KHZ TO 1700 KHZ ENGINEERING STATEMENT The engineering exhibit of which this statement is part has been prepared to present and show the analysis of field strength measurements that were made to determine the radiation efficiency of an 85-foot pole transmitting antenna manufactured by the Valcom Manufacturing Group, Ltd. [“the manufacturer”] on 1200 KHz and 1390 KHz and for a 75- foot pole transmitting antenna of like construction on 1390 KHz and 1700 KHz. The field strength measurement results were used to calculate unattenuated radiation efficiencies at 10 KHz increments between 1200 KHz and 1390 KHz for the 85-foot model and between 1390 KHz and 1700 KHz for the 75-foot model. The test measurements were made on each model pole during daytime hours with a power input of 250 watts from a test transmitter site beside the manufacturer’s factory in Guelph, Ontario. The antenna under test consisted in each case of the manufacturer’s standard pole with a “Valcosphere” (a wire-framed sphere) at the top and coil-loading centered approximately 1/3 of the total height above its base. The location was situated near the center of a 300 foot by 400 foot field and employed 120 buried copper wire ground radials that were each 120 feet in length. The operation was supervised, and the field strength measurements were made, by members of the manufacturer’s engineering staff. The 1200 KHz field strength measurements were made in November and early December of 2005 and the 1390 KHz and 1700 KHz measurements were made in late October and November of 2006 to ensure that all were subject to similar environmental conditions. The power was maintained at the 250-watt level using the direct method of power determination that is described in Section 73.51 of the Federal Communications Commission’s Rules. Details regarding the antenna input resistance and input current measurements are in the possession of the manufacturer. The field strength measurements were made using a Potomac Instruments type FIM-41 field strength meter at locations chosen to conform as closely to the recommendations of Section 73.186 of the Federal Communications Commission’s Rules as practicable – considering the physical characteristics of the terrain surrounding the transmitter site - using topographic maps with the assistance of a GPS receiver that was programmed to have its reference point at the transmitter site. du Treil, Lundin & Rackley, Inc. Consulting Engineers Valcom Antenna Approval Request Page 2 As it was impossible to space the radials evenly due to nearby terrain characteristics, a total of seven radials were measured instead of the six that are required as a minimum by Section 73.186 of the Rules. The maps showing the measurement locations are in the possession of the manufacturer. Figure 1 is a tabulation of the 1200 KHz field strength measurement data for the 85-foot pole and Figure 2 shows its graphical analysis. Figure 3 is a tabulation of the 1390 KHz field strength measurement data for the 85-foot pole while Figure 4 shows its graphical analysis. Figure 5 is a tabulation of the 1390 KHz field strength measurement data for the 75- foot pole and its graphical analysis is shown in Figure 6. Figure 7 is a tabulation of the 1700 KHz field strength measurement data for the 75-foot pole while Figure 8 shows its graphical analysis. The field strength measurements were analyzed in accordance with the “best fit” method outlined in Section 73.186 of the Federal Communications Commission’s Rules, using Graphs 15, 17 and 20 of Section 73.184 to determine the ground conductivity values of the measurements at 1200 KHz, 1390 KHz and 1700 KHz, respectively. The measurement data indicate that the 85-foot Valcom pole produced unattenuated field strength levels at 1200 KHz and 1390 KHz of 141 mV/M and 144.6 mV/M at one kilometer, respectively, and that the 75-foot Valcom pole produced values of 141.6 mV/M and 146.4 mV/M at 1390 KHz and 1700 KHz with 250 watts input power. The analyzed ground conductivity values agree well on a radial-to-radial basis – with variations among the different frequencies falling within the normally expected range considering the non-homogenous nature of “real world” soil - and unambiguously support the analyzed antenna efficiencies. The observed 141 mV/M and 144.6 mV/M unattenuated field levels for the 85- foot Valcom pole with 250 watts input power correspond to 1 KW values of 282 mV/M and 289.2 mV/M at 1200 KHz and 1390 KHz, respectively, while the observed values of 141.6 mV/M and 146.4 mV/M correspond to 1KW values of 283.2 mV/M and 292.8 mV/M for the 75-foot model at 1390 KHz and 1700 KHz. Figure 9 is a tabulation of calculated radiation efficiency values at 10 KHz increments that are based on these measured values. The dimensions and pertinent characteristics of the 85-foot and 75-foot Valcom pole antennas that were tested appear in Figures 10 and 11, respectively. Figure 12 is a sketch of the ground system. du Treil, Lundin & Rackley, Inc. Consulting Engineers Valcom Antenna Approval Request Page 3 The observed unattenuated field values of Valcom poles exceed those shown for their physical heights on the graph which appears as Figure 8 of Section 73.190 of the FCC Rules. Two aspects of their design are responsible for this, their Valcosphere top-loading and their loading coils that are situated far enough above ground to reduce the antenna-to ground voltage in the base region which, in turn, reduces dielectric losses in the nearby soil. The effects lead to antenna efficiency improvements that are predictable and measurable. The use of the physical heights of Valcom pole antennas to calculate their vertical radiation characteristics, as is done for conventional tower antennas, has previously been approved by the FCC based on a theoretical study prepared by the undersigned. [See Attachment A.] The field strength measurement data contained herein demonstrate that their radiation efficiency values can be known before they are constructed, within the frequency bands that were studied, and that proof-of-performance measurements after construction therefore are not necessary when they are used on frequencies within these ranges. It is requested that the FCC approve the unattenuated radiation values shown in the tabulation of Figure 9 for construction permit applicants proposing Valcom pole antennas in place of the values shown for their physical heights on Figure 8 of Section 73.190 of the FCC Rules. Ronald D. Rackley, P.E. du Treil, Lundin & Rackley, Inc. Consulting Engineers 201 Fletcher Avenue Sarasota, Florida 34237 January 26, 2007 Figure 1 Sheet 1 of 7 Valcom AM Broadcast Antenna (85 foot with Valcosphere) Operating Frequency: 1200 kHz 0 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 12/5/05 1618 450 2 0.45 12/5/05 1606 220 3 0.62 12/5/05 1515 185 4 0.75 12/5/05 1510 145 5 1.00 12/5/05 1505 110 6 1.25 12/5/05 1456 100 7 1.50 12/5/05 1445 80.0 8 1.80 12/5/05 1441 62.0 9 2.25 12/5/05 1437 50.0 10 2.50 12/5/05 1434 43.0 11 3.00 12/5/05 1428 33.0 12 4.00 12/5/05 1424 21.5 13 5.00 12/5/05 1418 13.5 14 7.00 12/5/05 1416 10.0 15 8.00 12/5/05 1408 7.00 16 9.50 12/5/05 1404 6.60 17 11.00 12/5/05 1359 6.00 18 13.00 12/5/05 1354 5.20 19 15.00 12/5/05 1350 3.30 Figure 1 Sheet 2 of 7 Valcom AM Broadcast Antenna (85 foot with Valcosphere) Operating Frequency: 1200 kHz 40 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 11/28/05 1601 470 2 0.50 11/28/05 1610 195 3 0.75 11/28/05 1618 140 4 1.10 11/28/05 1625 100 5 1.48 11/28/05 1353 64.0 6 1.76 11/28/05 1520 54.0 7 2.00 11/28/05 1345 50.5 8 3.00 11/28/05 1339 24.5 9 4.00 11/28/05 1335 17.0 10 5.00 11/28/05 1331 10.0 11 6.00 11/28/05 1328 7.50 12 7.00 11/28/05 1324 5.40 13 9.10 11/28/05 1319 4.00 14 11.00 11/28/05 1312 3.10 15 13.00 11/28/05 1306 2.00 16 14.70 11/28/05 1300 1.30 Figure 1 Sheet 3 of 7 Valcom AM Broadcast Antenna (85 foot with Valcosphere) Operating Frequency: 1200 kHz 100 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.26 11/28/05 1551 430 2 0.50 11/28/05 1546 190 3 0.75 11/28/05 1535 115 4 1.00 11/28/05 1132 97.0 5 1.27 11/28/05 1140 82.0 6 1.50 11/28/05 1145 66.0 7 1.79 11/28/05 1146 53.0 8 2.21 11/28/05 1149 35.0 9 2.77 11/28/05 1155 22.0 10 4.00 11/28/05 1200 17.0 11 6.00 11/28/05 1209 10.0 12 7.02 11/28/05 1216 5.80 13 9.00 11/28/05 1222 4.60 14 11.50 11/28/05 1229 2.30 15 13.00 11/28/05 1234 1.60 16 14.20 11/28/05 1239 1.20 Figure 1 Sheet 4 of 7 Valcom AM Broadcast Antenna (85 foot with Valcosphere) Operating Frequency: 1200 kHz 160 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 11/30/05 1227 399 2 0.50 11/30/05 1230 222 3 0.75 11/30/05 1235 140 4 1.03 11/30/05 1240 110 5 1.35 11/30/05 1242 75.0 6 1.75 11/30/05 1245 58.0 7 2.00 11/30/05 1248 54.0 8 2.50 11/30/05 1253 38.5 9 3.23 11/30/05 1257 30.0 10 4.00 11/30/05 1305 10.0 11 5.00 11/30/05 1315 9.30 12 7.50 11/30/05 1320 6.30 13 9.00 11/30/05 1332 3.20 14 11.10 11/30/05 1338 2.60 15 13.00 11/30/05 1344 1.70 16 15.00 11/30/05 1350 1.30 Figure 1 Sheet 5 of 7 Valcom AM Broadcast Antenna (85 foot with Valcosphere) Operating Frequency: 1200 kHz 215 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 11/30/05 1540 410 2 0.60 11/30/05 1536 180 3 0.90 11/30/05 1525 90.0 4 1.40 11/30/05 1518 55.0 5 1.80 11/30/05 1516 35.0 6 2.30 11/30/05 1514 30.5 7 3.00 11/30/05 1509 21.5 8 4.00 11/30/05 1505 14.0 9 5.00 11/30/05 1458 9.50 10 7.25 11/30/05 1452 6.30 11 8.00 11/30/05 1447 4.30 12 10.00 11/30/05 1440 3.80 13 11.00 11/30/05 1430 2.70 14 13.00 11/30/05 1422 2.40 15 15.00 11/30/05 1417 2.00 Figure 1 Sheet 6 of 7 Valcom AM Broadcast Antenna (85 foot with Valcosphere) Operating Frequency: 1200 kHz 270 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 12/5/05 1118 450 2 0.58 12/5/05 1122 200 3 0.75 12/5/05 1125 155 4 0.95 12/5/05 1129 126 5 1.25 12/5/05 1143 100 6 1.50 12/5/05 1146 80.0 7 1.75 12/5/05 1158 65.0 8 2.00 12/5/05 1203 43.0 9 2.50 12/5/05 1207 45.0 10 2.92 12/5/05 1212 32.0 11 4.00 12/5/05 1215 20.0 12 5.00 12/5/05 1220 11.5 13 7.00 12/5/05 1230 10.0 14 8.50 12/5/05 1238 7.00 15 10.60 12/5/05 1246 5.50 16 13.50 12/5/05 1300 4.50 17 15.50 12/5/05 1305 3.00 Figure 1 Sheet 7 of 7 Valcom AM Broadcast Antenna (85 foot with Valcosphere) Operating Frequency: 1200 kHz 315 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 11/23/05 1625 410 2 0.50 11/23/05 1615 189 3 0.75 11/23/05 1609 120 4 1.01 11/23/05 1558 93.0 5 1.23 11/23/05 1353 80.0 6 1.47 11/23/05 1359 69.0 7 1.75 11/23/05 1405 49.0 8 2.00 11/23/05 1412 37.5 9 2.48 11/23/05 1430 33.0 10 3.00 11/23/05 1435 22.2 11 3.90 11/23/05 1441 16.6 12 5.03 11/23/05 1449 6.60 13 6.00 11/23/05 1455 4.50 14 7.00 11/23/05 1504 4.60 15 8.00 11/23/05 1509 3.50 16 9.40 11/23/05 1515 3.00 17 11.60 11/23/05 1522 3.50 18 14.80 11/23/05 1531 2.10 Figure 3 Sheet 1 of 7 Valcom AM Broadcast Antenna (85 foot with Valcosphere) Operating Frequency: 1390 kHz 0 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 10/30/06 1634 510 2 0.45 10/30/06 1628 200 3 0.62 10/30/06 1615 142 4 0.75 10/30/06 1604 115 5 1.00 10/30/06 1455 82.0 6 1.25 10/30/06 1458 77.0 7 1.50 10/30/06 1500 58.0 8 1.80 10/30/06 1504 49.0 9 2.25 10/30/06 1506 32.0 10 2.50 10/30/06 1509 17.0 11 3.00 10/30/06 1533 22.0 12 4.00 10/30/06 1515 14.0 13 5.00 10/30/06 1520 9.50 14 7.00 10/30/06 1525 5.60 15 8.00 10/30/06 1528 3.50 16 9.50 10/30/06 1531 3.10 17 11.00 10/30/06 1533 3.00 18 13.00 10/30/06 1538 2.70 19 15.00 10/30/06 1542 1.80 Figure 3 Sheet 2 of 7 Valcom AM Broadcast Antenna (85 foot with Valcosphere) Operating Frequency: 1390 kHz 40 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 11/13/06 1510 455 2 0.50 11/13/06 1500 185 3 0.75 11/13/06 1455 132 4 1.10 11/13/06 1447 168 5 1.48 11/13/06 1438 47.0 6 1.76 11/13/06 1433 34.0 7 2.00 11/13/06 1430 40.0 8 3.00 11/13/06 1427 17.0 9 4.00 11/13/06 1425 10.0 10 5.00 11/13/06 1422 8.60 11 6.00 11/13/06 1420 5.00 12 7.00 11/13/06 1417 3.70 13 9.10 11/13/06 1413 3.50 14 11.00 11/13/06 1408 2.10 15 13.00 11/13/06 1404 1.00 16 14.70 11/13/06 1402 0.90 Figure 3 Sheet 3 of 7 Valcom AM Broadcast Antenna (85 foot with Valcosphere) Operating Frequency: 1390 kHz 100 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.26 11/13/06 1520 475 2 0.50 11/13/06 1525 190 3 0.75 11/13/06 1254 135 4 1.00 11/13/06 1257 125 5 1.27 11/13/06 1301 100 6 1.50 11/13/06 1304 74.0 7 1.79 11/13/06 1308 50.0 8 2.21 11/13/06 1312 25.0 9 2.77 11/13/06 1314 25.0 10 4.00 11/13/06 1317 14.0 11 6.00 11/13/06 1321 8.20 12 7.02 11/13/06 1325 6.20 13 9.00 11/13/06 1328 3.50 14 11.50 11/13/06 1332 2.10 15 13.00 11/13/06 1335 1.60 16 14.20 11/13/06 1338 1.30 Figure 3 Sheet 4 of 7 Valcom AM Broadcast Antenna (85 foot with Valcosphere) Operating Frequency: 1390 kHz 160 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 11/1/06 1506 410 2 0.50 11/1/06 1509 240 3 0.75 11/1/06 1238 155 4 1.03 11/1/06 1241 112 5 1.35 11/1/06 1244 90.0 6 1.75 11/1/06 1247 68.0 7 2.00 11/1/06 1249 63.0 8 2.50 11/1/06 1251 36.0 9 3.23 11/1/06 1253 27.0 10 4.00 11/1/06 1256 10.0 11 5.00 11/1/06 1258 11.0 12 7.50 11/1/06 1306 7.80 13 9.00 11/1/06 1309 2.50 14 11.10 11/1/06 1312 2.30 15 13.00 11/1/06 1315 2.00 16 15.00 11/1/06 1320 1.20 Figure 3 Sheet 5 of 7 Valcom AM Broadcast Antenna (85 foot with Valcosphere) Operating Frequency: 1390 kHz 215 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 11/1/06 1500 400 2 0.60 11/1/06 1454 180 3 0.90 11/1/06 1450 110 4 1.40 11/1/06 1447 67.0 5 1.80 11/1/06 1445 37.0 6 2.30 11/1/06 1443 33.0 7 3.00 11/1/06 1441 23.0 8 4.00 11/1/06 1438 14.0 9 5.00 11/1/06 1435 9.20 10 7.25 11/1/06 1430 5.20 11 8.00 11/1/06 1427 3.80 12 10.00 11/1/06 1423 2.80 13 11.00 11/1/06 1420 2.50 14 13.00 11/1/06 1414 1.80 15 15.00 11/1/06 1408 1.60 Figure 3 Sheet 6 of 7 Valcom AM Broadcast Antenna (85 foot with Valcosphere) Operating Frequency: 1390 kHz 270 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 10/31/06 1225 525 2 0.58 10/31/06 1228 330 3 0.75 10/31/06 1232 180 4 0.95 10/31/06 1235 145 5 1.25 10/31/06 1247 111 6 1.50 10/31/06 1255 100 7 1.75 10/31/06 1300 82.0 8 2.00 10/31/06 1303 43.0 9 2.50 10/31/06 1306 46.0 10 2.92 10/31/06 1309 32.0 11 4.00 10/31/06 1312 22.0 12 5.00 10/31/06 1317 10.0 13 7.00 10/31/06 1322 10.0 14 8.50 10/31/06 1328 6.20 15 10.60 10/31/06 1333 5.40 16 13.50 10/31/06 1338 3.50 17 15.50 10/31/06 1342 2.40 Figure 3 Sheet 7 of 7 Valcom AM Broadcast Antenna (85 foot with Valcosphere) Operating Frequency: 1390 kHz 315 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 10/31/06 1543 525 2 0.50 10/31/06 1539 225 3 0.75 10/31/06 1530 135 4 1.01 10/31/06 1520 100 5 1.23 10/31/06 1509 80.0 6 1.47 10/31/06 1507 74.0 7 1.75 10/31/06 1505 50.0 8 2.00 10/31/06 1502 45.0 9 2.48 10/31/06 1457 38.0 10 3.00 10/31/06 1454 22.0 11 3.90 10/31/06 1451 14.0 12 5.03 10/31/06 1446 12.0 13 6.00 10/31/06 1442 5.80 14 7.00 10/31/06 1439 5.40 15 8.00 10/31/06 1434 1.70 16 9.40 10/31/06 1407 2.40 17 11.60 10/31/06 1402 2.40 18 14.80 10/31/06 1354 1.30 Figure 5 Sheet 1 of 7 Valcom AM Broadcast Antenna (75 foot with Valcosphere) Operating Frequency: 1390 kHz 0 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 10/26/06 1625 440 2 0.45 10/26/06 1635 190 3 0.62 10/26/06 1304 135 4 0.75 10/26/06 1313 110 5 1.00 10/26/06 1320 80.0 6 1.25 10/26/06 1325 52.0 7 1.50 10/26/06 1330 39.0 8 1.80 10/26/06 1333 32.0 9 2.25 10/26/06 1336 24.0 10 2.50 10/26/06 1338 18.0 11 3.00 10/26/06 1342 15.0 12 4.00 10/26/06 1411 12.5 13 5.00 10/26/06 1415 10.5 14 7.00 10/26/06 1420 5.50 15 8.00 10/26/06 1427 4.10 16 9.50 10/26/06 1431 3.50 17 11.00 10/26/06 1434 3.50 18 13.00 10/26/06 1439 2.80 19 15.00 10/26/06 1443 1.50 Figure 5 Sheet 2 of 7 Valcom AM Broadcast Antenna (75 foot with Valcosphere) Operating Frequency: 1390 kHz 40 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 10/24/06 1530 450 2 0.50 10/24/06 1525 180 3 0.75 10/24/06 1518 125 4 1.10 10/24/06 1510 72.0 5 1.48 10/24/06 1500 45.0 6 1.76 10/24/06 1454 39.0 7 2.00 10/24/06 1450 39.0 8 3.00 10/24/06 1447 18.5 9 4.00 10/24/06 1443 8.70 10 5.00 10/24/06 1441 6.30 11 6.00 10/24/06 1438 4.30 12 7.00 10/24/06 1435 3.50 13 9.10 10/24/06 1432 2.90 14 11.00 10/24/06 1427 1.80 15 13.00 10/24/06 1422 1.00 16 14.70 10/24/06 1417 0.70 Figure 5 Sheet 3 of 7 Valcom AM Broadcast Antenna (75 foot with Valcosphere) Operating Frequency: 1390 kHz 100 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.26 10/24/06 1559 485 2 0.50 10/24/06 1555 190 3 0.75 10/24/06 1550 132 4 1.00 10/24/06 1244 115 5 1.27 10/24/06 1252 90.0 6 1.50 10/24/06 1248 72.0 7 1.79 10/24/06 1255 47.0 8 2.21 10/24/06 1310 36.0 9 2.77 10/24/06 1314 25.0 10 4.00 10/24/06 1325 13.5 11 6.00 10/24/06 1333 8.00 12 7.02 10/24/06 1338 5.50 13 9.00 10/24/06 1343 3.50 14 11.50 10/24/06 1347 2.15 15 13.00 10/24/06 1350 1.40 16 14.20 10/24/06 1350 1.00 Figure 5 Sheet 4 of 7 Valcom AM Broadcast Antenna (75 foot with Valcosphere) Operating Frequency: 1390 kHz 160 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 10/23/06 1300 420 2 0.50 10/23/06 1305 270 3 0.75 10/23/06 1310 160 4 1.03 10/23/06 1319 125 5 1.35 10/23/06 1322 79.0 6 1.75 10/23/06 1325 68.0 7 2.00 10/23/06 1328 58.0 8 2.50 10/23/06 1332 39.0 9 3.23 10/23/06 1334 30.0 10 4.00 10/23/06 1338 12.5 11 5.00 10/23/06 1341 13.0 12 7.50 10/23/06 1350 8.40 13 9.00 10/23/06 1357 2.70 14 11.10 10/23/06 1402 1.60 15 13.00 10/23/06 1407 1.70 16 15.00 10/23/06 1413 1.20 Figure 5 Sheet 5 of 7 Valcom AM Broadcast Antenna (75 foot with Valcosphere) Operating Frequency: 1390 kHz 215 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 10/23/06 1600 390 2 0.60 10/23/06 1548 190 3 0.90 10/23/06 1536 100 4 1.40 10/23/06 1533 72.0 5 1.80 10/23/06 1528 35.0 6 2.30 10/23/06 1523 28.0 7 3.00 10/23/06 1520 24.0 8 4.00 10/23/06 1515 14.0 9 5.00 10/23/06 1510 9.60 10 7.25 10/23/06 1505 6.20 11 8.00 10/23/06 1500 4.20 12 10.00 10/23/06 1455 3.30 13 11.00 10/23/06 1450 3.20 14 13.00 10/23/06 1444 1.70 15 15.00 10/23/06 1436 1.70 Figure 5 Sheet 6 of 7 Valcom AM Broadcast Antenna (75 foot with Valcosphere) Operating Frequency: 1390 kHz 270 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 10/26/06 1610 560 2 0.58 10/26/06 1606 240 3 0.75 10/26/06 1603 190 4 0.95 10/26/06 1559 140 5 1.25 10/26/06 1555 110 6 1.50 10/26/06 1552 90.0 7 1.75 10/26/06 1548 80.0 8 2.00 10/26/06 1546 47.0 9 2.50 10/26/06 1543 52.0 10 2.92 10/26/06 1540 31.0 11 4.00 10/26/06 1538 24.0 12 5.00 10/26/06 1535 12.0 13 7.00 10/26/06 1530 9.90 14 8.50 10/26/06 1527 6.20 15 10.60 10/26/06 1522 4.50 16 13.50 10/26/06 1516 3.50 17 15.50 10/26/06 1509 2.60 Figure 5 Sheet 7 of 7 Valcom AM Broadcast Antenna (75 foot with Valcosphere) Operating Frequency: 1390 kHz 315 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 10/20/06 1619 540 2 0.50 10/20/06 1613 235 3 0.75 10/20/06 1604 140 4 1.01 10/20/06 1517 100 5 1.23 10/20/06 1503 84.0 6 1.47 10/20/06 1459 76.0 7 1.75 10/20/06 1546 51.0 8 2.00 10/20/06 1451 47.0 9 2.48 10/20/06 1448 42.0 10 3.00 10/20/06 1438 23.0 11 3.90 10/20/06 1434 10.5 12 5.03 10/20/06 1425 9.60 13 6.00 10/20/06 1418 8.00 14 7.00 10/20/06 1415 7.00 15 8.00 10/20/06 1410 5.00 16 9.40 10/20/06 1405 2.50 17 11.60 10/20/06 1358 3.30 18 14.80 10/20/06 1350 1.80 Figure 7 Sheet 1 of 7 Valcom AM Broadcast Antenna (75 foot with Valcosphere) Operating Frequency: 1700 kHz 0 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 11/14/06 1602 500 2 0.45 11/14/06 1550 195 3 0.62 11/14/06 1515 145 4 0.75 11/14/06 1510 105 5 1.00 11/14/06 1358 94.0 6 1.25 11/14/06 1400 62.0 7 1.50 11/14/06 1402 47.0 8 1.80 11/14/06 1405 40.0 9 2.25 11/14/06 1408 29.0 10 2.50 11/14/06 1411 22.0 11 3.00 11/14/06 1413 19.0 12 4.00 11/14/06 1419 10.5 13 5.00 11/14/06 1422 7.20 14 7.00 11/14/06 1427 4.10 15 8.00 11/14/06 1430 3.40 16 9.50 11/14/06 1433 2.30 17 11.00 11/14/06 1436 1.75 18 13.00 11/14/06 1440 1.40 19 15.00 11/14/06 1443 1.10 Figure 7 Sheet 2 of 7 Valcom AM Broadcast Antenna (75 foot with Valcosphere) Operating Frequency: 1700 kHz 40 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 11/15/06 1630 500 2 0.50 11/15/06 1622 200 3 0.75 11/15/06 1617 148 4 1.10 11/15/06 1609 74.0 5 1.48 11/15/06 1606 53.0 6 1.76 11/15/06 1602 41.5 7 2.00 11/15/06 1600 38.0 8 3.00 11/15/06 1557 16.5 9 4.00 11/15/06 1555 9.00 10 5.00 11/15/06 1553 8.60 11 6.00 11/15/06 1550 5.00 12 7.00 11/15/06 1548 3.00 13 9.10 11/15/06 1545 2.50 14 11.00 11/15/06 1540 1.70 15 13.00 11/15/06 1536 1.10 16 14.70 11/15/06 1533 0.90 Figure 7 Sheet 3 of 7 Valcom AM Broadcast Antenna (75 foot with Valcosphere) Operating Frequency: 1700 kHz 100 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.26 11/15/06 1637 520 2 0.50 11/15/06 1640 240 3 0.75 11/15/06 1425 160 4 1.00 11/15/06 1430 100 5 1.27 11/15/06 1432 68.0 6 1.50 11/15/06 1435 58.0 7 1.79 11/15/06 1439 42.0 8 2.21 11/15/06 1442 26.0 9 2.77 11/15/06 1444 19.0 10 4.00 11/15/06 1447 11.5 11 6.00 11/15/06 1452 4.90 12 7.02 11/15/06 1454 2.70 13 9.00 11/15/06 1458 1.70 14 11.50 11/15/06 1502 1.35 15 13.00 11/15/06 1508 1.00 16 14.20 11/15/06 1511 0.98 Figure 7 Sheet 4 of 7 Valcom AM Broadcast Antenna (75 foot with Valcosphere) Operating Frequency: 1700 kHz 160 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 11/21/06 1308 440 2 0.50 11/21/06 1305 210 3 0.75 11/21/06 1300 160 4 1.03 11/21/06 1310 105 5 1.35 11/21/06 1312 88.0 6 1.75 11/21/06 1315 62.0 7 2.00 11/21/06 1317 51.0 8 2.50 11/21/06 1319 29.0 9 3.23 11/21/06 1321 26.0 10 4.00 11/21/06 1323 9.60 11 5.00 11/21/06 1325 9.60 12 7.50 11/21/06 1330 5.40 13 9.00 11/21/06 1335 1.90 14 11.10 11/21/06 1340 1.60 15 13.00 11/21/06 1344 1.30 16 15.00 11/21/06 1348 1.10 Figure 7 Sheet 5 of 7 Valcom AM Broadcast Antenna (75 foot with Valcosphere) Operating Frequency: 1700 kHz 215 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 11/21/06 1508 450 2 0.60 11/21/06 1506 170 3 0.90 11/21/06 1502 94.0 4 1.40 11/21/06 1459 64.0 5 1.80 11/21/06 1457 44.0 6 2.30 11/21/06 1455 26.5 7 3.00 11/21/06 1451 19.5 8 4.00 11/21/06 1448 13.5 9 5.00 11/21/06 1446 5.20 10 7.25 11/21/06 1443 4.80 11 8.00 11/21/06 1440 3.10 12 10.00 11/21/06 1435 2.40 13 11.00 11/21/06 1432 1.90 14 13.00 11/21/06 1426 1.40 15 15.00 11/21/06 1420 1.10 Figure 7 Sheet 6 of 7 Valcom AM Broadcast Antenna (75 foot with Valcosphere) Operating Frequency: 1700 kHz 270 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 11/22/06 1302 480 2 0.58 11/22/06 1258 250 3 0.75 11/22/06 1251 150 4 0.95 11/22/06 1245 135 5 1.25 11/22/06 1309 105 6 1.50 11/22/06 1313 78.0 7 1.75 11/22/06 1317 64.0 8 2.00 11/22/06 1319 35.0 9 2.50 11/22/06 1321 41.0 10 2.92 11/22/06 1324 28.0 11 4.00 11/22/06 1327 17.5 12 5.00 11/22/06 1331 11.0 13 7.00 11/22/06 1335 7.60 14 8.50 11/22/06 1339 4.40 15 10.60 11/22/06 1344 3.20 16 13.50 11/22/06 1349 2.40 17 15.50 11/22/06 1354 1.80 Figure 7 Sheet 7 of 7 Valcom AM Broadcast Antenna (75 foot with Valcosphere) Operating Frequency: 1700 kHz 315 Degree Radial Point Distance Time Field Strength Desig. (km) Date (local) (mV/m) 1 0.25 11/22/06 1532 450 2 0.50 11/22/06 1527 250 3 0.75 11/22/06 1520 142 4 1.01 11/22/06 1510 100 5 1.23 11/22/06 1500 82.0 6 1.47 11/22/06 1456 74.0 7 1.75 11/22/06 1454 56.0 8 2.00 11/22/06 1451 54.0 9 2.48 11/22/06 1448 39.0 10 3.00 11/22/06 1438 22.0 11 3.90 11/22/06 1435 15.0 12 5.03 11/22/06 1431 11.0 13 6.00 11/22/06 1428 7.50 14 7.00 11/22/06 1424 4.10 15 8.00 11/22/06 1421 3.70 16 9.40 11/22/06 1416 2.70 17 11.60 11/22/06 1412 2.00 18 14.80 11/22/06 1407 1.20 Figure 9 Tabulation of Radiation Efficiency of Valcom AM Broadcast Antennas Unattenuated Field for 1.0 KW (mV/M at 1.0 KM) Unattenuated Field for 1.0 KW (mV/M at 1.0 KM) Model Pole Model Pole Frequency (KHz) 85 Foot 75 Foot Frequency (KHz) 85 Foot 75 Foot 1200 282.0 1460 -- 285.6 1210 282.4 1470 -- 286.0 1220 282.8 1480 -- 286.3 1230 283.2 1490 -- 286.7 1240 283.6 1500 -- 287.0 1250 284.1 1510 -- 287.3 1260 284.5 1520 -- 287.6 1270 284.9 1530 -- 287.9 1280 285.2 1540 -- 288.2 1290 285.6 1550 -- 288.5 1300 286.0 1560 -- 288.8 1310 286.4 1570 -- 289.1 1320 286.8 1580 -- 289.4 1330 287.1 1590 -- 289.7 1340 287.5 1600 -- 290.0 1350 287.9 1610 -- 290.3 1360 288.2 1620 -- 290.5 1370 288.6 1630 -- 290.8 1380 288.9 1640 -- 291.0 1390 289.2 283.2 1650 -- 291.3 1400 -- 283.6 1660 -- 291.6 1410 -- 283.9 1670 -- 291.9 1420 -- 284.3 1680 -- 292.1 1430 -- 284.6 1690 -- 292.4 1440 -- 285.0 1700 -- 292.8 1450 -- 285.3 Figure 10 Figure 11 Figure 12 ATTACHMENT A FCC OET Memorandum May 1, 2003