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

[WB6BNQ]

Hi Peter,

While you did not say, I am going to guess you are considering making a weather
proof (or nearly so) housing for your ceramic patch antenna.  I have used the
little patch antennas with the magnetic base from Motorola for the top of my
car.  They seem to last quite long as the one I have has been out in the elements
(San Diego, CA) for around 9 or ten years.  Yes, its plastic housing is showing
some discoloration from the UV rays, but no operational issues.

However, for a housing, may I suggest a small PYREX glass mixing bowl.  It is a
little heavy but very sturdy and some have an edge that could be used to hold it
in place by fitting a collar around it made out of wood that would get clamped to
the base which could be made out of wood.  The wood would have to be varnished
with a good Urethane.

Anyway, my two cents;

Bill....WB6BNQ


Magnus Danielson wrote:

> On 09/05/2010 10:06 PM, Peter Krengel wrote:
> > Thanks Robert, Stanley and Bob for the tips.
> >
> > I tested some materials in a microwave oven and they all seemed to
> > be good because there was no heating (maybe handwarm at 800W).
> >
> > So the magic word seems to be refracting effects even at 1.5GHz...
> >
> > As I cannot get a commercial helf sphere for putting over the patch
> > has anyone an idea what to take for i.e. from kitchen?
>
> One should recall that some plastics absorb more water than others... so
> unless one has a good info on their absorbtion, putting them into water
> overnight and the pour it out and wipe it clean just prior to microwave
> it would form a better simulation...
>
> Cheers,
> Magnus
>
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