S.M4-145-SB

4-stack dipole array, 137-153 MHz, split boom

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Data Sheet
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S.M4-145-SB
Electrical
Frequency 137 – 153 MHz
Max. Input Power 500 W
3 dB Beamwidth, H-Plane 180° (offset configuration), 360° (omni configuration)
Polarisation Vertical
3 dB Beamwidth, E-Plane 16 °
Impedance 50 Ω
Gain Omni 5.7 dBd
Offset 8.7 dBd
VSWR < 1.5:1
Front-To-Back Ratio > 7 dB offset
Antistatic Protection All metal parts DC-grounded (Connector shows a DC-short)
Environmental
Ingress Protection IP68
Mechanical
Elements 12.7 dia. x 1.6 mm wall aluminium alloy grade 6063T6
Connection(s) N(f) on RG213/U cable
Boom Material 63.5 mm dia. x 6.3 mm wall aluminium alloy grade 6082T6
Fasteners Stainless steel grade A2-70
Length 6m (supplied in two sections)
Element Clamps Diecast Al / Zinc alloy
Historic Brand Skymasts
Wind Load 799 N (160km/h)
Weight 27 kg / 59.52 lb
Balun Encapsulant Polyurethane Resin U-600
  • The S.M4 is an array of phased centre fed folded dipoles mounted on an aluminium mast for PMR / Trunked radio applications.
  • Each folded dipole balun assembly and associated harness junction is completely encapsulated in poyurethane resin, totally preventing moisture ingress.
  • At VHF the antenna disassembles and flat packs for ease of shipping.
  • Former Skymasts brand product.

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4-stack dipole array, 137-153 MHz, split boom S.M4-145 -SB

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