[MLB-WIRELESS] transmission through building materials

[Tony Langdon]

> i've tried a google search on this, without much luck.  can anyone 
> point me towards specs for the absorption/transmission of 2.4gHz RF 
> through various common building materials?  and perspex in particular.

You can always do your home testing - if you can get hold of a small sample.
Put a glass of water and a sample of the material in the microwave (the
water is a "dummy load" to absorb excess microwave energy).

Cook on high for 30 secs to a minute.  Afterwards, check the temperature of
the sample.  If it's cold, it doesn't absorb RF.  If it's warm, it absorbs a
little.  If it's hot, it absorbs a lot (and will attenuate signals heavily).
A lot of the guys who home brew microwave antennas do this trick on whatever
material they are considering for radomes.

Don't try this with metallic or other conductors, they will arc and possibly
damage the oven.

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