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| DB408 BROAD BAND ANTENNA 6.6 or 7.8 dB GAIN, 406-512 MHz |
| Two DB404 antennas are combined to form the DB408
antenna with its 4 stack collinear array of dual dipoles. Broad Response - With 14 to 24 MHz bandwidth, DB408 is highly suitable for duplex operation. Moisture Resistant - VAPOR-BLOC� cable harness provides weather protection and assures in phase signal distribution to all elements. Circular Pattern - DB 408 has dual dipoles positioned at 90 degree angles from each other. Offset Pattern - DB408L has all dual dipoles in line, collinearly, on the mast. Side Mounting - Either model can be side mounted, resulting in significantly different patterns. Dual Models - Two DB404 antennas on the same mast function independently. Field Changeable - Patterns can be adjusted with ordinary hand tools. Lightning Resistant - The radiators operate at DC ground and the aluminum mast with its pointed cap 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 DB408 for omni pattern, DB408L for offset pattern, DB408D* for dual antennas with omni patterns and DB408DL for dual antennas with offset patterns. DB365-OS Clamps are included. Order DB5012 Side Mount Kit if needed. Other size clamps can be special ordered. Examples: DB408-B, DB408L-B for 450-470 MHz range. Order jumper cable separately, if desired |
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SPECIFICATIONS |
| Electrical Data | |
| Frequency Ranges - MHz | A = 406-420 B = 450-470 C = 470-488 D = 488-512 |
| Bandwidth - MHz VSWR Nominal Impedance - ohms |
Same as above 1.5 to 1 or less 50 |
| Gain (over half-wave dipole) Rated power input - watts |
6.6 or 7.8 250 |
| Vertical beamwidth (half power) | 14� |
| Decoupling between antennas
(dual) - dB Lightning protection |
30 minimum 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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| Mechanical Data | |
| Mast - (aluminum)
- in. (mm) Radiating elements (aluminum) - in. (mm) |
1.75 (44.45) OD with .0625 (1.588) to .125 (3.175) wall .375 (9.525) OD with 0.58 (1.473) wall |
| Maximum exposed area (flat
plate equivalent) - ft� (m�) |
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 (34.6) |
| 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 |
*Top mounted antenna: Wind rating is greatly increased when antenna is
side mounted.
NOTE: The mechanical specifications are slightly degraded for the antenna covering the
120-150 MHz band.
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WISCO International, Inc. -
MIAMI, FL U.S.A. Fax: (954) 370-3997 | E-mail: wiscointl@wiscointl.com |
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