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MODELS
515,516&528
Short Wave Broadcast High Power Log-Periodic Antennas
Model 528
Model 515/516
Because of seasonal and diurnal variations of the ionosphere, shortwave broadcasters have found it necessary to change frequencies at regular intervals. Frequency changes can be simplified with the use of wideband frequency-independent antennas. For this application TCI offers the Models 515, 516, and 528 high power log-periodic antennas. Log-periodic antennas have long been desired for their wide band characteristics, efficient land use, and modest price. Heretofore, however, high power log-periodic antennas have not been possible due to the extremely high voltage stresses on individual elements nor have they provided the gain of more conventional approaches. These problems have been overcome with the unique radiator and array configuration developed at TCI. The radiator designs employed are the equivalent of "fattened" radiators with lowered Q and reduced voltage stress. These radiators bring the further benefit of increasing the effective "active region" radiating length in each curtain resulting in greater radiation efficiency and higher power gain. TCI analytical techniques have been employed to provide large volumetrical apertures and resultant high power gain while maintaining logperiodic performance. As with all TCI antennas, this line of shortwave broadcast antennas utilizes high quality, rugged, exhaustively tested components and materials. No fiberglass assemblies are used throughout the
* High Power - Able to handle 2 megawatt
peak power (500 kw carrier power)
* High Power Gain - (over 20 dBi) provides
high receive signal levels for good listening
* * * * *
Slewable over +23 Wide Frequency Bandwidth - 3-27 MHz Low VSWR - 1.5:1 max. Rugged Construction Easily and Quickly Installed
antenna. Alumoweld wire, segmented where necessary with high quality ceramic fail-safe insulators, is used to provide long trouble-free service life. Carefully tested corona protection details are employed where necessary in the curtain. No dissimilar contacts, which have historically been the major cause of corrosion, exist anywhere in the tower structure or antenna curtains.
Long Range Broadcast 528 Longer broadcast circuits (in excess of 1000 km) require high power and low take-off angles. The 528 has a frequency bandwidth of 6-27 MHz, is able to handle 250 kW of AM carrier power with 100% modulation, and provides a low take-off angle. The 528 gives 20.7 dBi power gain which results in an effective radiated carrier power (ERP) of 29 million watts when used with a 250 kW transmitter. Extremely high signal levels occur at the receiving locations assuring high quality reception and listener satisfaction. Figure 1 shows received signal level contours resulting from a 528 and a 250 kW transmitter located in San Francisco. It can be seen that the 528 achieves a signal level of 0.56 mV/m, which is the CCIR minimum acceptable signal level, all the way to Recife, Brazil, a 10,300 km path. The high true power gain of the 528 provides real economic value. This antenna provides 9 dBi gain more than most standard logperiodic antennas, allowing a reduction in required transmitter power for a given ERP with the attendant savings in acquisition cost and electricity charges. Increasing antenna gain by 9 dBi is equivalent to increasing the power of a 50 kW transmitter to 400 kW. The gain of the 528 is equivalent to that of a giant rhombic occupying twice as much land area. 528S The 528S is a higher powered slewable version of the 528. It can handle 300 kW carrier power at 100% modulation and can slew +23. It provides a gain of up to 22.2 dBi which results in an ERP of 50 million watts. One 528S can perform the function of three standard HRS 4/4/0.5 dipole curtain arrays. Receiving signal levels are shown in parentheses in Figure 1. Medium Range Broadcast For medium range broadcasting (700 km to 3000 km) moderate transmitter power and high take-off angles are required. Optimum for this application are the TCI Models 515 and 516 log-periodic antennas which can handle 100 kW carrier power with 100% modulation. The 515 provides take-off angles of 30 to 45 degrees, and the 516 provides a take-off angle of 21 degrees for slightly longer paths. Both antennas have negligible side and back lobes, and low VSWR. These antennas are extremely efficient resulting in high ERP and received signal level.
528 Antenna located in Belmont, Ca.,operating at 250kW with 100% modulation
Figure 2 shows the received signal level contours for a 516 antenna with a 100 kW transmitter located in San Francisco. With the 516, excellent reception (1 mV/m) occurs all the way to Mexico City. Application Engineering TCI has developed and demonstrated expertise in high power shortwave broadcast antennas. The 515, 516, and 528 have wide application for shortwave broadcasting and can be used in most projects. In those instances where the particular application requires a special solution, TCI can offer related antennas such as our curtain arrays or linear arrays and accessories such as compensated high power open wire transmission line assemblies.
Field strength contour (millivolts/meter) resulting from 528 antenna and 250 kW AM transmitter located in San Francisco. Data generated by ITS propagation analysis computer program. CCIR minimum acceptable signal level 0.56 mV/m. The values for the 528S with a 300 kW transmitter are shown in parentheses.
Field strength contour (millivolts/meter) resulting from 516 antenna and 100 kW transmitter located in San Francisco. Data generated by ITS propagation analysis computer program.
Specifications
MODEL 528 Polarization ................. Horizontal VSWR........................... 1.5:1 Maximum Input Impedance ......... 300 ohms Balanced Power ........................... 250 kW AM Carrier (375 kW avg., 1000 kW Peak) Side Lobe Level .......... Less than -14 dB Front-to-Back Ratio .... 14 dB Minimum Environmental............. Designed in accordance with Performance EIA Specification RS-222C for loading of 160 km/h (100 mi/h) wind (Higher environmental capability available upon request)
Size
Model Number 528-1 528-2 Frequency 6-27MHz 9-27 MHz Height ft. mtr. 245 79.4 183 55.6 Length* ft. mtr. 600 183 430 131 Width* ft. mtr. 650 198 500 152.4
Gain and Pattern Data
Freq. 6 MHz 9 MHz 11 MHz 15 MHz 17 MHz 27 MHz Lower HPP 6.5 6 5.5 5 4.7 3 Take-Off Angle 13 12.5 12 11 10.5 7 Upper HPP 21 20 18.5 16.5 16 11 Azimuth Beamwidth 33 33 32 32 31 31 Gain 18.7 dBi 18.7 dBi 18.7 dBi 19.2 dBi 19.7 dBi 20.7 dBi
MODEL 528S Polarization ................. Horizontal VSWR........................... 1.5:1 Maximum Slew ............................. +23 Input Impedance ......... 300 ohms Balanced Power ........................... 300 kW AM Carrier (450 kW avg., 1200 kW Peak) Side Lobe Level .......... Less than -14 dB Front-to-Back Ratio .... 14 dB Minimum Environmental............. Designed in accordance with Performance EIA Specification RS-222C for loading of 160 km/h (100 mi/h) wind (Higher environmental capability available upon request)
Size
Model Number 528S-1 528S-2 528S-3 Frequency 5.95-26 MHz 9-26 MHz 6.8-26.1 MHz Height ft. mtr. 322 98 183 55.6 268 82 Length* ft. mtr. 656 200 430 131 527 161 Width* ft. mtr. 1050 320 580 176 893 273
Gain and Pattern Data
Freq. 6 MHz 9 MHz 11 MHz 15 MHz 17 MHz 26 MHz Lower HPP 6.5 6 5.5 5 4.7 3 Take-Off Angle 13 12.5 12 11 10.5 7 Upper HPP 21 20 18.5 16.5 16 11 Azimuth Beamwidth 24 24 24 24 24 24 Gain 20.5 dBi 20.7 dBi 20.8 dBi 21.5 dBi 21.7 dBi 22.2 dBi
MODEL 515/516 Polarization ................. Horizontal VSWR........................... 2.0:1 Maximum Input Impedance ......... 300 ohms Balanced Power ........................... -50 kW AM Carrier Power (75 kW avg., 200 kW Peak) or -100 kW AM Carrier Power (150 kW avg., 400 kW Peak) -250 kW AM Carrier Power (516 - 3A only) Side Lobe Level .......... Less than -13 dB Front-to-Back Ratio .... 14 dB Minimum Environmental............. Designed in accordance with Performance EIA Specification RS-222C for loading of 160 km/h (100 mi/h) wind (Higher environmental capability available upon request)
Size
Model Number 515-2 515-3 515-4 516-2 516-3 516-4A Frequency 4-9 MHz 3.9-18 MHz 3-20 MHz 3.9-17.9 MHz 5.95-17.9 MHz 5.95-26.1 MHz Height ft. mtr. 165 50 121 36.9 141 43 225 68.6 145 44.2 145 44.2 Length* ft. mtr. 432 132 333 102 378 115 476 145 352 107 352 107 Width* ft. mtr. 410 125 362 110.5 502.5 153 497 151 381 116 381 116
Gain and Pattern Data
Lower HPP 515-2 15 515-3,4 20 516-2,3,3A 10 Model Take-Off Angle 30 45 21 Upper HPP 42 74 33 Azimuth Beamwidth 68 86 68 Gain 12.5 dBi 12 dBi 14.5 dBi
* Measured from extreme guy points.
Elevation and Azimuth Patterns
Model 528
(Azimuth pattern at elevation angle of beam maximum) gain in dBi
Model 528S
528S elevation patterns are indentical in shape to the patterns of the 528. The azimuth patterns at slew angles of 0, 10, and 20 are shown.
Model 516
Model 515
515/16/28-160401(c) TCI, 2001 Data and specifications subject to change without notice.
www.tcibr.com 47300 Kato Road, Fremont, California 94538, USA * 1 800 824-8074 (USA) * Tel 1 510 687-6100 * Fax 1 510 687-6101

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