1996: Our First 2 Meter Ladder Yagi
This is our 1996 antenna erected at Marconi's 1902 transmitter site in Glace Bay, Nova Scotia. Our new antenna is an improved version of this rope yagi. Use of EZNEC4 and the design of VE7BQH have enabled us to tweak its performance somewhat, and while we call it a rope yagi, the supporting lines of the 2014 version are actually made of thin Kevlar cord.
Compared to most rope, Kevlar has very low stretch, so spacing between the elements of the antenna will change very little under tension.
Note the sag and skew of the 1996 antenna caused by the wind. This has the effect of spreading out the main lobe of the antenna, reducing forward gain. The use of Kevlar will permit much greater tensioning of the antenna, reducing sag and skew, while two intermediate ABS supports (crutches) at 10 and 20m along the yagi will further reduce movement in the wind.
The Kevlar, being much thinner and lighter than the polypropylene rope used in 1996 (above) will significantly reduce antenna wind load and weight as well.
We would like to thank The Canadian Amateur (TCA) for granting us their permission to use the following document on this site:
Table 2 Elements Coordinates:
Standing Wave Ratio (SWR) Plot of the Pouch Cove 43 Element Ultra-Light Yagi: