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MODEL
Log-Periodic Antenna
548
Log-periodic antennas are used extensively for high frequency communications circuits because of their wide frequency bandwidth and compact size. In applications where a single antenna is required, TCI normally supplies horizontally polarized log-periodic antennas supported by a single tower support structure. (See TCI Models 501 and 532 data sheets.) There are many applications where a horizontally polarized logperiodic antenna supported by two tower structures is beneficial. When the co-location of several antennas is required, a smaller, compact array can be formed by horizontal antennas sharing common towers. The Model 548 antenna is designed specifically for applications of this nature. The Model 548 is a transposed dipole horizontally polarized log-periodic antenna composed of the highest quality material. It contains high quality, exhaustively tested components and materials. All radiators, feedlines, and catenaries are of Alumoweld, a wire composed of a high strength steel core surrounded by a highly conductive, corrosion resistant welded coating of aluminum. All feedline and radiator tip insulators are made of high strength glazed alumina, a material with an extremely low loss tangent (.001) which is virtually impervious to the effects of ultraviolet radiation, dirt, and salt spray. Fixed station log-periodic antennas traditionally have used fiberglass for the catenary and drop wire assemblies on the basis of its excellent dielectric and tensile strength properties. However, field experience has shown that minute, difficult-todetect flaws in the material, RF burning, and small nicks incurred during installation may result in catastrophic failure later on.
* Two tower design for use in arrays * High power gain * Wide bandwidth * Rugged construction * Factory preassembled
Fiberglass will also deteriorate when stored for long periods at high temperature and humidity. These facts all indicate that a material other than fiberglass should be used in antennas. The Model 548 uses Alumoweld catenaries and drop wires, segmented where necessary by high strength insulators. Because of the compact, simplified design of the Model 548, it may be used in applications where antenna siting is difficult. The Model 548 antenna lends itself to the necessary modifications for installation in difficult situations or where stringent communication requirements occur.
Specifications
Polarization ............................ Horizontal VSWR...................................... 2.0:1 Maximum Azimuth Beamwidth .............. 60 Minimum Front-to-Back Ratio ............... 13 dB Minimum Environmental Performance........................... Designed in accordance with EIA 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; or 160 km/h (100 mi/h), wind, no ice. Also complies with EIA specification EIA-222-E for the indicated wind speeds at the top of the mast.
Gain and Pattern Data Azimuthal Gain Lower Upper Beamwidth Relative Half- Nominal Half- between to Power Take-off Power Half-Power Frequency Isotropic Point Angle Point Points 3 MHz 4 MHz 9 MHz 25 MHz 30 MHz 11.2 dBi 11.2 dBi 11.6 dBi 12.5 dBi 12.3 dBi 18 18 16 11 10 13 35 35 30 22 20 27 67 67 53 33 30 45 76 76 76 70 70 70
Take-off Angle Variable
Constant 3-30 MHz 12 dBi
Power and Impedance Data Model Input Power Handling Number Impedance Capability 548-N-02 548-N-03 548-N-04 548-N-06 50 ohms 50 ohms 50 ohms 50 ohms Receive 10 kW Avg /50 kW PEP 25 kW Avg /50 kW PEP 1 kW Avg /2 kW PEP
Connector Type N Female 15/8" EIA Female 15/8" EIA Female Type N Female
Size and Frequency Data (Single Curtain, Two Towers) Model Take-off Height Length* Number Angle Frequency (m) (ft) (m) (ft) 548-1-N 548-3-N 548-1K-N 548-3K-N Variable Variable Constant Constant 4-30 MHz 3-30 MHz 4-30 MHz 3-30 MHz 30.5 39.6 48.6 61 100 130 159 200 85.5 110.7 117.7 155.5 280.4 363 386 510
Width* (m) 106.2 121.5 127.4 160.7
(ft) 348.6 398.5 418 527
Tower Spacing (m) (ft) 64.0 76.2 64.0 76.2 210 250 210 250
*measured from extreme guy points
Shipping Weight and Volume (Single Antenna) Model Number 548-1-N 548-3-N 548-1K-N 548-3K-N Number of Boxes 7 8 11 14 Gross Weight (kg) (lbs) 2100 2600 3140 3910 4600 5710 6900 8600 Volume (m3) (ft3) 4.8 6 7.2 9.1 170 211 255 320
NOTE: Front support poles, normally class 2, 3, or 4 Douglas Fir, are required but not supplied by TCI. Check with TCI for specific requirements.
Elevation and Azimuth Patterns (Azimuth pattern at elevation angle of beam maximum) gain Constant Take-off Angle Variable Take-off Angle
548-020401(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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