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| DB408T DOWNTILT BROAD BAND ANTENNA 5.5 to 7.7 dB GAIN, 406-512 MHz |
| DB404T mounts to the top of a tower or structure
and provides 4.5 or 9 degrees downtilt in omni or elliptical radiation patterns. Ideal for
mobile systems that need maximum signal strength close to the antenna. Extremely Rugged - Resists wind to 125 mph (201 km/hr) Broad Response - With 14 to 24 MHz bandwidth, this antenna is suitable for duplex operation. Moisture Resistant - VAPOR-BLOC® cable harness provides weather protection and assures inphase signal distribution to all elements. Circular Pattern - DB 408T has dual dipoles positioned at 90 degrees from each other. Offset Pattern - DB408LT has all dual dipoles in line, collinearly, on the mast. Side Mounting - Either model can be side mounted, resulting in significantly different patterns. Field Changeable - Patterns can be adjusted with ordinary hand tools. Lightning Resistant - Radiators operate at DC ground and the aluminum mast with its pointed top provides a low resistance discharge path to the tower or ground system. Ordering Information - Use model number for correct frequency and specify termination if non-standard. Order DB408T9 for omni with 4.5 degrees downtilt, DB408LT4 for elliptical pattern with 4.5 degrees downtilt, DB408T9 for omni with 9 degrees downtilt, DB408LT9 for offset with 9 degrees downtilt. DB365-OS Clamps are included. Other size clamps can be special ordered. Examples: DB408T4-B, DB408LT4-B for 450-470 MHz range. Order jumper cable separately, if desired. |
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| Electrical Data | |
| Frequency Ranges - MHz | B = 450-470 C = 470-488 |
| Bandwidth VSWR Nominal Impedance - ohms |
Same as above 1.5 to 1 or less 50 |
| Gain (over half-wave dipole) at 0° elevation angle (horizontal) - dB | |
| DB408T4 (4.5° downtilt, Omni) DB408LT4 (4.5° downtilt, elliptical) DB408T9 (9° downtilt, Omni) DB408T9 (9° downtilt, elliptical) |
5.5 6.7 0 1.2 |
| Gain (over half-wave dipole) - dB | |
| DB408T4 (-4.5° elevation angle) DB408LT4 (-4.5° elevation angle) DB408T9 (-9° elevation angle) DB408T9 (-9° elevation angle) |
6.5 7.7 6.0 7.2 |
| Rated power input - watts Lightning protection |
250 Direct ground |
| Standard Termination: Captive
Type N-Male attached to end of flexible lead. Other fittings are available on special order. N-Female is available. If UHF connector is required, an adaptor is provided. |
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Note: Special frequencies are available; call customer services.
(Example: S408T9-D for 488-512 MHz)
| Mechanical Data | |
| Mast - (aluminum) - in. (mm) Radiating elements (aluminum) - in. (mm) |
1.75 (44.45) OD with .062 (1.575) wall .375 (9.525) OD with 0.58 (1.473) wall |
| Maximum exposed area (flat plate equivalent)
- ft² (m²) |
1.9 (.177) |
| Wind rating:* Survival without ice - mph(km/hr) Survival with .5" (12.7 mm) radial ice - mph (km/hr) |
over 125 (201) 85 (137) |
| Lateral Thrust at 100 mph (161 km/hr) - lbf (N) | 76 (338) |
| Bending moment at top clamp at 100 mph (161 km/hr) - ft. lbs. (kg m) |
250 (113.4) |
| Overall Length - ft. (m) Net weight (w/clamps) - lbs. (kg) Shipping weight (w/clamps) - lbs. (kg) |
9.42 (2.87) 17 (7.71) 29 (13.15) |
| Mounting clamps (Galvanized Steel) | DB365-OS |
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WISCO International, Inc. -
10388 W. STATE RD. 84 #
109 MIAMI, FL 33324-4252. USA Fax: (954) 370-3997 | E-mail: wiscointl@wiscointl.com |
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