WISCO International (Decibel Products / Fiberglass

DB636 with 6 dBd gain and DB638 with 8 dBd gain are UHF omnidirectional antennas. Radiators are enclosed in a 3" (76.2 mm) OD Horizon Blue^TM radome made of Minimum-Tip-Deflection® (MTD®) fiberglass, Decibel's heavy duty radome material that resists high winds with very little tip deflection.

Full UHF Coverage - Four models fulfill spectrum needs for UHF conventional, paging and radiotelephone communications.
Sturdy Construction - In addition to the MTD fiberglass radome, each antenna has a 26" (660.4 mm) weather-resistant mast made of strong 6061-T6 aluminum alloy.
Very Rugged - DB636 resists winds to 200 mph (322 kph), and DB638 to 150 mph (241 kph), each with .5" (12.7 mm) of icing.
Engineered to Last - All metals used in radiator, feed and matching systems are copper or brass, which minimizes galvanic reaction and reduces intermodulation.
Lightning Resistant - A large diameter conductor extends from top and bottom of each antenna.
Moisture Resistant - A removable drain plug is located at the top and bottom of each antenna.
Ready to Install - DB365-OS Clamps and VAPOR-WRAP® are provided.

Ordering Information - Order DB636 for 6 dBd gain and DB638 for 8 dBd gain. Use model number for correct frequency. Clamps are included. Order jumper cable separately, if desired.

Electrical Data
	DB636	DB638
Frequency Range - MHz	406-512	406-512
Bandwidth Gain (maximum) - dBd	See table 6	See table 8
Beamwidth "E" Plane (half power) Beamwidth "H" Plane (half power)	20° Omni	10° Omni
Maximum power input - watts Input impedance - ohms VSWR	500 50 1:5 to 1	500 50 1:5 to 1
Lightning protection Termination	Direct ground Type N-Female (fixed)	Direct ground Type N-Female (fixed)

Mechanical Data
	DB636	DB638
Lateral thrust at 100 mph (161 km/hr) - lbf (N)	64.4 (286.5)	108 (480.4)
Radome OD - in. (mm) Radome ID - in. (mm) Radome length - ft. (m)	3 (76.2) 2.5 (63.5) 7.8 (2.39)	3 (76.2) 2.5 (63.5) 14.4 (4.39)
Mast OD - in. (mm) Mast length - in. (mm)	2.5 (63.5) 26 (660.4)	2.5 (63.5) 26 (660.4)
Maximum exposed area (flat plate equivalent) ft² (m²)	1.61 (.15)	2.70 (.25)
Wind rating: Survival without ice - mph (km/hr) Survival with .5" (12.7 mm) radial ice - mph (km/hr)	225 (362.0) 200 (321.8)	173.2 (278.8) 150.0 (241.4)
Tip deflection at 100 mph (161 km/hr) Bending moment 1" (25.4 mm) below top of mast at 100 mph (161 km/hr) - ft./lbs (N/m)	1.1° 210.0 (284.7)	6.6° 700.8 (950.3)
Radome Radiators Support pipe	Fiberglass Brass 6061-T6 Aluminum	Fiberglass Brass 6061-T6 Aluminum
Net weight - lbs. (kg) Shipping weight - lbs. (kg)	30 (13.61) 40 (18.14)	40 (18.14) 85 (38.55)
Clamps (galvanized steel)*	DB365-OS	DB365-OS

Frequency Ranges Available - MHz
DB636/638-A	406-436
DB636/638-B	425-455
DB636/638-C	450-482
DB636/638-D	480-51