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

Robert Atkinson robert8rpi at yahoo.co.uk
Sun Sep 5 17:03:18 UTC 2010


Hi Peter,
Sounds like refraction. The plastic has more effect at lower angles.
 
Robert G8RPI

--- On Sun, 5/9/10, Peter Krengel <krengeldatec at gmx.de> wrote:


From: Peter Krengel <krengeldatec at gmx.de>
Subject: [time-nuts] GPS ceramic patch in what plastic housing?
To: time-nuts at 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
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