[time-nuts] GPS ceramic patch in what plastic housing?

Bob Camp lists at rtty.us
Sun Sep 5 17:35:12 UTC 2010


What are you trying to achieve ? 

If you are looking for a simple cover for the patch, the microwave oven is your friend. Anything that heats up in a microwave is a bad idea, unless it's thin. Most materials with a variable cross section will act as a lens to some extent.


On Sep 5, 2010, at 12:12 PM, "Peter Krengel" <krengeldatec at gmx.de> wrote:

> 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
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