Hi Peter, Sounds like refraction. The plastic has more effect at lower angles. Robert G8RPI
--- On Sun, 5/9/10, Peter Krengel <krengelda...@gmx.de> wrote: From: Peter Krengel <krengelda...@gmx.de> Subject: [time-nuts] GPS ceramic patch in what plastic housing? To: time-nuts@febo.com Date: Sunday, 5 September, 2010, 17:12 Hello, I just did some experiments using a ceramic patch antenna inside a small plastic (80 x 30 x 20mm) screw box and experienced much bader signals at lower elevations. The plastic is marked as PS (I guess polystyrole ?). Further experiments covering a GPS with the same kind of box seemed to effect the signals too. On the other hand covering the patch with a flat pcs of the same material didnt effect the antenna. Is there possibly a cavity effect? What to take best? Any ideas? Thank you Peter, DG4EK _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.