Radiating Masts

Radiating Masts

SMC carry a stock range of components which enables a simple tubular steel or tubular aluminium mast to be converted to a radiating mast for the 200kHz to 28MHz MF and HF bands. (Spot frequency or tunable with appropriate antenna matching unit).

Any of the masts described in our data sheets PA2 or TS series may be converted making a very versatile range of omni directional antennas from 6-30 metres in height, in 2”, 3” or 3½” diameters. For the lower frequencies (or where mast height is a consideration) a capacity hat arrangement may be included in the design for more efficient operation.

The SMC PA2 series of portable aluminium masts are particularly suited to transportable, portable or permanent use with the appropriate fittings, and the TS series masts are normally for permanent installation.

Please contact us for a quote or for more information.

Tubular Steel Specs

Height6 - 30 metres, 3" or 3½" diameter
StaysHT galvanised steel wire or to customers requirements, to 120' or 90' in plan
Stay insert insulatorsCeramic loop stay or egg type and number to design height and power rating
Base insulator35/65kV wet/dry flashover fitted lighting spark gap arrestor, dependent upon power rating
Capacity hatNormally included in stays or can be supplied separately in cadmium copper
Feed pointStainless steel
All other fittingsGalvanised steel
Capacity450 - 1500 PFD dependant upon height and capacity hat design
Input impedance2 - 10 Ohm, 50 ohm for 1/4 wave height

Aluminium Specs

Height4 - 18 metres
Mast diameter5Omm nominal
StaysNormally 6mm diameter, pre-stretched polyester or galvanised steel with insulator inserts for permanent sites. Also available in Parafil, Keviar or Philistran
Base insulator15/30kV wet/dry flashover ceramic fitted lighting spark gap arrestor
Capacity hatIncluded in top stay, hard drawn copper elements bordered to mast sections
HF feed pointStainless steel
Capacity120 - 420 PFD (Power Flux Density)
Input impedance2 - 10 ohm, 50 ohm for 1¼ wave height

General Specs

Frequency range200kHz - 28MHz to design frequency or capacity
BandwidthNormally tuneable by antenna matching unit
Radiator pattern H planeOmni-directional
Input impedanceNormally in the range 2 - 10 ohm but 50 ohm for 1/4 wave height
Power handlingUp to 30kW