Whip2.JPG
I have been using this whip antenna for a while, it is a 3 element wire collinier, when covered with heatshrink it was detuned and needed 60mm trimmed from the top. Now it works perfectly. I also made a 9 element in the same way but the detuning from heatshrink was more severe, and there is not enough top element to trim down. I have been using this whip without any insulation material so it is affected by rain which detunes it .
Whip.jpg
I have been working on the de-tuning effect and the velocity factor of heatshrink , and have made another antenna, this time I have used a velocity factor of .94
I re-calculated all the formulas for the elements and the coils at .94 percent and covered it with heatshrink. Testing today and its working good, but I will need to do some trimming to get it A1 . Will report findings
Mike
Burnie, Tasmania
I have been using this whip antenna for a while, it is a 3 element wire collinier, when covered with heatshrink it was detuned and needed 60mm trimmed from the top. Now it works perfectly. I also made a 9 element in the same way but the detuning from heatshrink was more severe, and there is not enough top element to trim down. I have been using this whip without any insulation material so it is affected by rain which detunes it .
Whip.jpg
I have been working on the de-tuning effect and the velocity factor of heatshrink , and have made another antenna, this time I have used a velocity factor of .94
I re-calculated all the formulas for the elements and the coils at .94 percent and covered it with heatshrink. Testing today and its working good, but I will need to do some trimming to get it A1 . Will report findings
Mike
Burnie, Tasmania
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