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On site there is a foursquare built for DX 80 as described in classic computer modelling programmes.Construction was completed July 2004 and is located on Vancouver Island West coast Canada.At the centre of the sysem is a phasing switch box that is capable of beaming at a corner of choice and the other three elements are reflectors.Each corner has a null frequency of 3600+/-16 kHz and forty ground radials.The step ladders give you a proportion of the elements. Each element is painted with black paint.The guy ropes are at thirty and fifty feet respectively.Looking forward to a good DX season

 

The current picture shows the TX tower and 2 element mono bander built by Force 12.The original antenna was 10 years old.The original null point

was no-longer at factory specs.During July 2012,the yagi was removed and taken apart back to its basic components.The sections of the antenna

that had Aluminium metal elements and were in contact with stainless steel bolts (a process called"galling" )was oxidizing and possibly responsible for

the "wandering null point" frequency.A product called Ni-anti seize was recommended by manufacturers as a solution to galling.The antenna was

re-assembled and via crane force replacement,the antenna is performing back to factory specs.My thanks for the mentorship all hams involved in this

exercise

73 s

Terry

84213 Last modified: 2012-08-12 01:59:22, 1499 bytes

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