Hi For any microwave material, the good old “toss it in a microwave” test is a quick and dirty one. If the material heats up, it’s lossy. Yes, there are other fairly exciting things that can happen other than it warming a bit ….
Bob > On Feb 11, 2017, at 5:51 PM, MLewis <[email protected]> wrote: > > Interesting. > My guess wasn't a material made for RF but a carbon added to give a decent > black colour. > > "It is not inconceiveable that off-spec or scrap materials from the > production might end up as mousemats." and "stealth material". > Very interesting. > At an airshow many years ago, these mouse pads were a promotional give-away > by the Department of National Defence in Canada... > > I'm now seeing some multipath signals sneak through, usually in the single > digital strength but for brief moments as high as 15 dBs. Coming from > elevation 5 to 10 degrees, between azimuth 300 to 330 and also azimuth 30 and > 60. I'm suspecting the office tower at 135 that sticks up above the bank of > buildings. I'll have to add a 1" strip up to 3" high in LOS to that building > to see what that does. > The other multipath signals remain at 0.0. > > Michael > > On 11/02/2017 1:22 PM, Poul-Henning Kamp wrote: > > -------- > > > > I can guarantee you that it is not the neoprene itself which does it. > > > > It could be residual ZnO, used to catalyze polymerisation of the neoprene, > > but more likely it is metal deliberately added to the neoprene to > > change the RF impedance of the material. > > > > ... > > > > [1] If you arrange for the imperance to ramp from open to short you > > have a "stealth material". > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
