[time-nuts] GPS ceramic patch in what plastic housing?
n4ua.va at gmail.com
Mon Sep 6 19:01:26 UTC 2010
I have perhaps a dozen dead Trimble "Bullet" antennas, allegedly done in
by near-by lightning. Inside looks like the same ceramic patch as the
mobile antennas, with different electronics on the back side of the
"ground plane". The radome is gasketed, and the whole assembly can be
disassembled and reassembled; they have TNC female connectors. $10 plus
shipping, US only. They weigh nothing, so I'll see how cheaply they can
geo - n4ua
bg at lysator.liu.se wrote:
>> On 09/05/2010 06:12 PM, Peter Krengel wrote:
>>> 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
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
More information about the time-nuts