[Community] Case Kit

Denis Shulyaka shulyaka at gmail.com
Thu Jul 19 16:20:15 CEST 2012

2012/7/19 Dr. H. Nikolaus Schaller <hns at goldelico.com>:
> Some of you are not only waiting for a GTA04 board but also for the
> case kit components [1] so that a 3D printed case gives a complete device.
> We now have good ideas how to build and connect a new UMTS antenna,
> but it needs experimentation, simulation and measurements until we can
> have it mass produced. Please note that getting an impedance matched
> piece of wire is easy to achieve, but one that really radiates well and
> efficiently isn't. And an inefficient antenna drains the battery faster than
> we want...
> But we are still stuck with a new earpiece receiver (the original one
> is no longer produced and not even available from over-stock - except
> one expensive source having access to Asus spare parts). And contacting
> it to the GTA04 board is also very difficult (there are only two small
> copper+gold blobs for miniature springs - too small to add some connector
> and too risky to solder some wires).
> And - unfortunately - the replacement GPS antenna we had choosen
> to buy from DigiKey was discontinued by the manufacturer. Most likely
> because the low noise amplifier transistor went out of production.
> So as simple as it may look, so difficult it is to synchronize these parts
> and keep the price low. Well, we could now start to design our own GPS
> antenna module, but we know that you already are moaning how expensive
> everything is. Getting something from mass production is always cheaper
> than adapting and customizing components to our needs.
> If the mass produced thing fulfills our needs... For GPS would be easy
> if we could get some 15x15mm >20dBm with 50mm U.FL cable from
> a big distributor.
> Nikolaus
> [1]: http://www.handheld-linux.com/wiki.php?page=GTA04%3ACase%20Kit
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> Community at openphoenux.org
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Hi Nikolaus,

We don't have to match the exact dimensions of the original modules
since we are designing the case ourselves. Would it be easier if we
don't limit ourselves to the same dimensions?


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