"Phil" wrote in message
...
Hello
Young friend of mine is finishing his EAA Biplane , he would like to
mount the detector/antenna inside the fabric so as to not show on the
outside of upper center section , the airplane is in the silver/aluminum
stage of painting , the alum. powder in primer is used to block UV , he is
wondering if it could also block the RF from the Sats., I told him that we
might get an answer off the group.
Thanks
Phil L.

If alum powder particles are small enough to be mostly encapsulated by the
primer so that conductivity of the finished surface is poor, the attenuation
might be low (high conductivity will attenuate the signal). Make a test
patch slightly bigger than the GPS antenna. Set up the GPS to look at the
sats received power (most GPSs have this capability). Move the finished
patch over the antenna and watch the received power. There is a very good
chance it will work. It all depends on the amount of Al powder in the mix.
J. Severyn
AF6QO
RV-9A N79LH