Microwave absorption of ice is also low as is that of beeswax, rosin and
pitch.
I use a conventional hotplate for melting the latter 3.
Bruce
Bruce Griffiths wrote:
Below 600C the only significant source of microwave absorption in wood
is the water content:
http://pubs.acs.org/doi/abs/10.1021/ie901336k
Bitumen has very low microwave loss so if the asphalt doesnt have any
taconite in it its loss should be low.
http://www.nrri.umn.edu/egg/REPORTS/TR200419/CTS0510.pdf
You could always try the microwave oven test with some samples.
One thing to consider is the reflection loss from the roof due to its
non unity dielectric constant.
Bruce
Mike Naruta AA8K wrote:
True Bruce. Alas, those trees to the West are matched by
trees to the East. Power lines run in front of the house
to the South. And the towers, guy wires, and wire antennae
are to the North in the back yard. It's like looking up
a funnel to see the satellites.
I have another Motorola patch under the roof that also works.
What is the dielectric of wood sheathing and asphalt shingles?
I may try the cake pans on the inside one; not much snow
inside the attic. :)
Mike - AA8K
Bruce Griffiths wrote:
A pity that the GPS receiver elevation mask can't generally be made
to be azimuth dependent.
You could then have a higher elevation limit in the direction of
those trees.
However, it is possible in principle with an M12+T, M12M T or
similar timing receiver which provides the relative timing
contribution of each SV to the solution, to back out the
contribution of a given SV and compute the corresponding timing
correction for software correction of the PPS pulse timing.
Bruce
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