WISCO International (Decibel Products

Stacked Arrays - Two antennas provide 10 dB gain and four antennas 13 dB gain. A vertical spacing of .75 to 1.0 wavelengths between antennas is recommended.
Key Applications - DB230s are ideal for mobile systems that need gain in one sector, stations located along a coast or with geographical boundaries, point-to-point systems and systems to reduce interference on the backside of the antenna.
Rugged - Antennas operate effectively in severe environments. Elements are made of .75" (19.05 mm) tubing and reinforced with .875" (22.23 mm) sockets at the boom. The size and thickness of the materials are increased for larger sized antennas; heavy duty clamps and orientation brackets are also supplied.
Lightning Resistant - Constructed of all metal with direct grounding makes the antenna almost immune to lightning.
No Field Tuning - Antennas is adjusted at the factory for minimum VSWR.
Ordering Information - Specify exact frequency and termination of non-standard. Order DB230 for a single antenna, DB230-2 for a 2-antenna array, and DB230-4 for 4 antenna array. Clamps, phasing harnesses for arrays, and orientation brackets (for larger models) are included. Other size clamps are available. Order DB365-W Clamp for mounting on a wooden pole. Order jumper cable separately, if desired.

Electrical Data
Frequency Ranges - MHz	A=30-41, B=41-46, C=46-50, E=72-76, H=145-150, J=150-160 JJ=220-222, K=160-173,L=173-174
VSWR Bandwidth	2 to 1 VSWR 3%, using center frequency of each band
VSWR Bandwidth	1.5 to 1 VSWR 1%, using center frequency of each band
Nominal Impedance - ohms Gain (over half wave dipole) - dB Maximum power input - watts	50 7.0 500
Horizontal beamwidth (half power points) Front to back ratio - dB	76� 17
Lightning protection	Direct ground
Standard Termination: Captive Type N-male attached to end of flexible lead. Other fittings are available on special order. If UHF connector is required, an adapter is provided.

Mechanical Data
	35 MHz	50 MHz	74 MHz	160 MHz
Support Boom (aluminum) - in. (mm) Elements (aluminum) - in. (mm) Bracket - in. (mm)	2x3 (50.8x76.2) with .125 (3.18) wall .750 (19.05) diameter Half-Y type, Gal. steel 2 (50.8) OD	2x3 (50.8x76.2) with .125 (3.18) wall .750 (19.05) diameter Half-Y type, Gal. steel 2 (50.8) OD	2x3 (50.8x76.2) with .125 (3.18) wall .750 (19.05) diameter Half-T type, Gal. steel 2 (50.8) OD	1.5x2 (38.1x50.8) with .078 (1.98) wall .750 (19.05) diameter Aluminum angle Welded to boom
Wind rating: Survival without ice - mph (km/hr) Survival with .5" (12.7 mm) radial ice - mph (km/hr)	110 (177) 75 (121)	over 125 (201) 100 (190)	over 125 (201) over 125 (201)	over 125 (201) over 125 (201)
Lateral thrust at 100 mph (161 km/hr) - lbf (N)	189 (840.6)	159 (707.2)	91 (404.8)	37 (164.6)
Height (vertical) - ft. (m) Width (horizontal) - ft. (m)	13.6 (4.15) 10.5 (3.2)	9.7 (2.96) 8.0 (2.44)	6.6 (2.01) 6.5 (1.98)	3.0 (.91) 3.4 (1.04)
Net weight (w/clamps, brackets)-lbs (kg) Shipping weight (w/clamps)-lbs (kg) Mounting clamps	57 (25.84) 90 (40.82)* Galvanized steel	52 (23.59) 88 (39.92) Galvanized steel	27 (12.25) 40 (18.14) Galvanized steel	11 (4.99) 26 (11.79) Stainless steel