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Re: Re: S band helix

Beware of ABS and PVC material. I test a piece of ABS tubing in my 
microwave oven and as good ABS can be to make an isulator on HF ABS 
became very hot when exposes to microwaves. PVC is also heating but 
it take a longer exposition. I was planning to build a radome over my 
patch feed but i change it in using shrinking tarpaulins sheet the 
one used to cover boats in winter.

Remember to put a glass of water in your microwave oven when you will 
conduct the test. And ask your wife first to avoid unnecessary 
discussions...or complaints...

You can show her the famous little light bulb illumination trick in 
placing the light bulb on your piece of tubing. (Child love the 
experiment) Be honest here adults too...

My explanation microwaves heats humidity contain in the material the 
more porous the material and more heat will be induced. I could be 
wrong here...


Luc Leblanc VE2DWE
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