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MODELS
Extended Aperture Vertical Log-Periodic Antennas
510&512
Model 510
Model 512
The TCI Extended Aperture* series of log-periodic antennas represents the most compact and structurally efficient class of broad-band, highly directive antennas available anywhere. The Extended Aperture principle is a means of bringing broad-side gain into play where highly directive antennas are needed, rather than relying on the less efficient end-fire gain. The result is greater gain at lower total installed cost. Until the TCI Extended Aperture Series of antennas, the HF user wanting very high directivity and broad-bandwidth was faced with a substantial investment in land and structure, The two widely used approaches to the simultaneous requirements for high gain and broad-bandwidth, rhombics and very long log-periodics, rely heavily on end-fire gain to achieve their directivity, and hence are both quite large. Typical installations exceed 1,000 feet in length, and represent a major structural and land investment, Traditional transposed dipole log-periodic antennas are composed of elements which are physically near 1/2 wavelength long when they are active, This fact limits their broadside directivity, forcing the designer of highly directive LPA's to rely on very long structures, with many elements active, acting primarily in an end-fire fashion. The elements of TCI's Extended Aperture Series are a full wavelength long, or longer, contributing very strongly to directivity through broadside gain. This has the effect of giving the Extended Aperture Family greater gain in a much more compact area than traditional approaches. The Extended Aperture Principle is accomplished in a way which decreases the Q of the elements in the active region. This spreads out the active region, somewhat further increasing directivity and increasing the power handling capability of the structure.
* Outperforms rhombics * For very long distance circuits * Very high gain * Compact * Structurally simple
The Models 510 and 512 are vertically polarized members of the Extended Aperture Family, and are primarily utilized on very long distance circuits where system gain is at a premium and low take-off angles are required. For this reason a ground screen is frequently used in front of the antenna, or the antenna is sited close to and overlooking the ocean or other conductive surface, in order to minimize pattern undercutting. All members of the Extended Aperture Series utilize only the tested and proven TCI aluminum fittings and high purity alumina insulators used extensively throughout the 500 series of antennas. The Extended Aperture Series is available either in kit form, or TCI will undertake a turn-key installation.
Specifications
Model 510 Model 512 Polarization ......................Vertical Vertical Directive Gain ..................fo-14.3 dB fo-16.0 dB Relative to 7 MHz 14.8 dB 7 MHz 16.5 dB Isotropic 28 MHz 15 dB 28 MHz 17.0 dB Azimuth Plane..................92 Nominal 52 Nominal Beamwidth between Half-Power Points Angle of Upper...............13.2 13.2 Half-Power Points Level of Side Lobes.........-15 dB -15 dB Relative to Main Lobe Front-to-back Ratio .........fo-17 dB fo-10 dB 7 MHz 21 dB 28 MHz 25 dB and above and above VSWR................................2.0:1 2.0:1 Environmental..................Designed in accordance with EIA Performance Specification RS-222C for loading of 225 km/h (140 mi/h) wind, no ice, 145 km/h (90 mi/h) wind, 12 mm (1/2") radial ice
Size and Frequency Coverage
Model Number 510-1-N 510-2-N 510-4-N 512-1-N 512-2-N Frequency Range 4-30 MHz 5-30 MHz 7.5-30 MHz 4-30 MHz 5-30 MHz Height ft. mtr. 269 223 142 269 223 82 68 44 82 68 Length* ft. mtr. 536 450 344 525 448 163 137 105 160 136 Width* ft. mtr. 381 315 243 565 463 116 96 74 172 141
* Measured from extreme guy points.
Power & Impedance Data
Model Number 510-N-01 510-N-02 510-N-03 510-N-04 512-N-01 512-N-02 512-N-03 512-N-04 Input Impedance 300 Balanced 50 coaxial 50 coaxial 50 coaxial 150 Balanced 50 coaxial 50 coaxial 50 coaxial Power Handling Handling 50 kW Avg. 200 kW PEP Receive 10 kW Avg. 50 kW PEP 25 kW Avg. 50 kW PEP 50 kW Avg. 200 kW PEP Receive 10 kW Avg. 50 kW PEP 25 kW Avg. 50 kW PEP Connector
Type N Female 1-5/8" EIA Female 1-5/8" EIA Female Type N Female 1-5/8" EIA Female 1-5/8" EIA Female
Model 510 Azimuth Pattern 7 MHz
Elevation Plane Pattern over perfect earth
Origin of pattern plot is -5dB relative to an isotrope
Model 512 Azimuth Pattern 7 MHz
510/512-220201(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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