Vhf Side Mounted Dipole Antennas

Transcript

VHF Side Mounted Dipole Antennas 108-200 MHz SMD2 Series The SMD2 Series side mounted dipoles are broad band antennas which, through different phasing and mounting arrangements can offer a variety of patterns (generally cardioid) tailored to specific coverage requirements. These antennas can be mounted in dual arrays for 3dB gain, or four-stack arrays for 6dB gain over a single dipole. The SMD2 is constructed of heavy gauge corrosion resistant anodised aluminium tubing with a high pressure cast aluminium hub assembly and stainless steel fittings. This combination provides an exceptionally strong antenna, suited for extreme weather conditions. The SMD22 is a ruggedised antenna featuring extremely heavy walled tubing, all welded aluminium construction and a black epoxy coating to aid in solar heat retention. The SMD24 is a stainless steel version and is ideal in corrosive marine environments. All of the antennas are electrically identical. SMD2 SMD antenna construction allows for the entire antenna to rest at ground potential, making it highly recommended in lightning prone applications. • Can be phased to provide 3 dBd or 6 dBd gain, in a variety of patterns tailored to suit specific requirements. An extensive range of phasing harnesses available. • Full bandwidth coverage for both single antennas and phased arrays - ideal in community sites • High strength - SMD2 features anodised aluminium construction and high pressure cast aluminium centrepiece • Rugged and stainless steel versions also available • Normally available ex-stock for immediate delivery • Available in all stainless steel version designed for air band coverage (118-137MHz) with a VSWR at <1.3:1 across this entire band • SMD20-36 and SMD20-41-DIN are a industry leading PIM rated (-150dBc) antennas, providing low IM noise characteristics for optimum performance. P-40115-2 1 rfi.com.au VHF Side Mounted Dipole Antennas 108-200 MHz SMD2 Series Typical VSWR response (SMD20-36) -15 0 Typical VSWR response (SMD20-41-DIN) -25 +15 H Plane at ¼ wave antenna to mast spacing 0 H Plane at ¼ wave antenna to mast spacing Peak gain at 0° of 2dBd Typical VSWR response (SMD2,22,24) Typical VSWR response (SMD2,22,24) +25 H Plane at ¼ wave antenna to mast spacing H Plane at ½ wave antenna to mast spacing Peak gain at 0° of 1dBd Peak gain at 0° of 2dBd Peak gain at 90°, 270° of 2dBd Electrical Model Number Nominal Gain dBi (dBd) Frequency MHz Tuned Bandwidth VSWR (Return Loss) Nominal Impedance W Vertical Beamwidth Horizontal Beamwidth Input Power W SMD20-36 SMD20-41-DIN SMD2 SMD22 SMD24 SMD2-99 Nominally 2 (Unity) but varies with mounting arrangements 130-150 148 - 174 148 - 175 108 - 200 Entire band 10% <1.5 :1 (14dB) <1.5:1 (14dB) 50 Typically 85° at ¼ l Typically 70° at ¼ l Typically 74° at ¼ l antenna - mast spacing antenna - mast antenna - mast spacing spacing Typically 228° at ¼ Typically 175° at ¼ l antenna - mast l antenna - mast spacing spacing 750 500 Typically 230° at ¼ l antenna - mast spacing 250 Mechanical Model Number Construction Length m Weight kg Termination Mounting Area SMD20-36 SMD20-41 Welded aluminium with alodined finish 1.24 3 0.8 1 7/16 DIN female N female with with 9142 cable 9142 cable tail tail 500mm x 48mm 100mm x 40mm diam. diam. Suggested Clamps No ice Projected Area cm² With ice Wind Load No ice (Thrust) @ 160km/h N With ice Wind Gust Rating km/h 868 1523 103 181 654 1183 77 140 Torque @ 160 No ice km/h Nm With ice 28 150 14 25 SMD2 SMD22 SMD24 SM1D2-99 Thick walled Thick walled Heavy duty Stainless steel aluminium aluminium aluminium with with cast with cast aluminium with cast aluminium black epoxy finish aluminium hub hub hub 0.9 1.3 1.5 2.0 3.0 2.0 N female with RG213 cable tail 300mm x 40mm diam. aluminium 1 x UCR1 or UCR2 849 927 1644 1633 101 110 195 194 300mm x 38mm 300mm x 40mm diam. stainless diam. aluminium 810 1604 96 190 1373 2524 163 299 48 95 110 202 >240 50 97 57 101 P-40115-2 rfi.com.au 2