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

[Predrag Dukic]

Bill,

Pyrex ( and any other glass) could reflect too much. It is true that glass,

depending on composition, is not absorbing microwaves, and does not 
heat itself in the owen,

but how much it is transparent at 2.4 ghz should be checked somehow...

P. Dukic





At 00:55 6.9.2010, you wrote:
>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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