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

bg at lysator.liu.se bg at lysator.liu.se
Mon Sep 6 18:14:15 UTC 2010


> On 09/05/2010 06:12 PM, Peter Krengel 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.
>>
>
> Finding a suitable top for that gps module/patch/.. that is both the
> right material and the right shape is hard. Just the right shape is
> much easier. So:
>
> I have had good success with vacuum forming such a beast. One particular
> glass cup I have in the kitchen is flat top conical, of just the right
> size. I put it on top of the ground plane, a 1mm sheet of
> clear polycarbonate above that, and with an air pump and heat gun I
> pulled the PC down around it. A bit of white paint on the inside, and
> it looks really good.
>
>
> /Kasper Pedersen

Many swedish reference stations have a snow cone made of (iirc) Plexiglass
- Polymetylmetacrylic (PMMA). It should be formable using Kaspers above
method.

   http://swepos.lmv.lm.se/stationer/hjo.htm

--
  Björn




More information about the time-nuts mailing list