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S.M4-405

Dipole ArraysS.M4-405

4-stack dipole phased array 380 - 430 MHz

Description

  • 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.
  • Former Skymasts brand product.

Specifications

Electrical
Model S.M4-405
Frequency 380 - 430 MHz
Max. Input Power 250 W
Polarisation Vertical
3 dB Beamwidth, E-Plane 16 °
3 dB Beamwidth, H-Plane 160 °
Impedance 50 Ω
Gain 8.7 dBd (10.9 dBi)
VSWR < 1.5:1
Front-To-Back Ratio 7 dB
Antistatic Protection All metal parts DC-grounded (Connector shows a DC-short)
Mechanical
Elements 12.7 x 1.6 mm dia. / 0.5 x 0.06 in.
wall aluminium alloy grade 6063T6
Connection(s) N(f) on RG213/U cable
Boom Material 38.1 x 3.2 mm dia. / 1.5 x 0.13 in.
wall aluminium alloy grade 6082T6
Fasteners Stainless steel grade A2-70
Length 2600 mm
Element Clamps Diecast Al / Zinc alloy
Wind Load 232 N (160 km/h)
Weight Approx. 6 kg / 13.23 lb.
Balun Encapsulant Polyurethane Resin U-600
Environmental
Ingress Protection IP68

Diagram and Mounting

RADIATION PATTERNS

E-Plane | 405 MHz E-Plane | 405 MHz

RADIATION PATTERNS

H-Plane | 405 MHz H-Plane | 405 MHz

Ordering Designations

Model Product No. Frequency
4-stack dipole phased array S.M4-405 380 - 430 MHz

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