VHF Shrouded Dipoles

Models DA-SH, DE-SH & DE-SHW

The Shrouded Dipole provides a rugged mechanical design with a reduced surface area, making it ideal for a harsh or marine environment. To achieve this, the dipole element is shrouded in a ‘pultruded’ fibreglass radome which is sheathed with black heat shrink to assist ice shedding.

The dipole element is DC grounded which assists reduction of precipitation static. The centre feed exits through the heavy duty, element to boom casting. This casting is then attached to the boom with three radial bolts to provide reliable fixing. All booms for the VHF Shrouded Dipoles use 48mm OD x 4.5mm grade 6063-T6 aluminium tubing. A coax tail of RG213 is fed down the centre of the boom and terminates with an N plug connector. Standard tail length is 1m from the boom exit.

All models have a vertical radiation pattern which can be offset by locating the dipole at specific distances from a metallic support structure or by using a reflector.

Suitable clamps to use are the Pole Mount Clamp (CLPM) for mounting to a wooden pole or the Cross Clamp (CLCR) to a rigging pipe support.

Frequency Range (MHz) 70-108 110-180
Bandwidth (MHz) 8 20 30
Return Loss (dB & VSWR) <-14dB 1.5:1
Maximum Power (W) 100
Cable Type & Length RG213, 1 Metre
Connector Type N Plug
Radome Length (m) 1.8 1.0
Radome Diameter (mm) 40
Boom Length (m) 1.5 1.0
Boom Diameter (mm) 48
Projected Area (m2) 0.15 0.09
Wind Loading at 150km/h (N) 165 100
Weight (kg) 4.9 3.7

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