Eric, I heard this from another Amateur many years back. He said it
was to provide a load for the Magnetron so that you don't blow it. I
don't know if he is right or not, but I always did it any way. I felt
if you boiled the water and nothing happened to heat the sample, it was
probably a fair dielectric.
73/Mike
Eric Gustafson wrote:
> Mike,
>
> We frequently use this crude but relatively effective method to
> identify dielectric material that is potentially suitable for RF
> work. But we never use any water along with the sample.
>
> Why are you including a cup of water? And what is the "it" that
> shouldn't warm up? The cup of water or the plastic? The water
> will almost certainly get warm regardless of how good the plastic
> is.
>
> Is the water to use to determine the length of time? For
> example; "Water is warm so the time was long enough to heat the
> plastic if it was going to heat"?
>
> Just curious.
>
> 73, Eric N7CL
>
To: <towertalk@contesting.com>
> >Date: Fri, 23 Oct 1998 13:41:14 -0600
> >From: Mike Lamb <n7ml@imt.net>
> >
> >Jim,
> >
> >It might be a good idea, just to be safe, to throw the material
> >into a microwave oven with a cup of water for a minute and see if
> >it warms up or not. If it does, it may not be very good for RF.
> >
> >73/Mike
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