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Alford Slot antenna for 1.3GHz operation

Alford Slot antenna for 1.3GHz operation

The slotted cylinder antenna, Alford Slot, was first introduced by Andrew Alford in 1946. Its an omnidirectional horizontally polarized antenna. Performance of this antenna have been measured with some simple homemade equipment and a PC. All measurements done at 1296.8 MHz using a VCO (locked to a 13 MHz reference), a logarithmic detector from Analog devices AD8313 connected to an A/D converter. The A/D converter is connected to the PC parallel port, the antenna rotator is also controlled by the parallel port.

Dimensions given in G3JVL/G5YGF/G4KNZ paper

Antenna type??? Tube dimensions??????????? Slot width(mm) Slot lenght(mm)
End fed?????????? 31.8 mm OD, 20swg wall????? 4??????????? 510
End fed?????????? 35.0 mm OD, 1.1mm wall????? 8??????????? 510
End fed?????????? 38.1 mm OD, 16swg wall???? 11??????????? 510
Center Fed??????? 31.8 mm OD, 20swg wall????? 4??????????? 510
Center Fed??????? 35.0 mm OD, 1.1mm wall????? 8??????????? 510
Center Fed??????? 38.1 mm OD, 16 swg wall??? 11??????????? 510

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