GPS External antenna detect issue / test recipes

Daniel Willmann daniel at
Thu May 1 03:46:51 CEST 2008

On Wed, 30 Apr 2008 20:18:45 -0300
Werner Almesberger <werner at> wrote:

> Andy Green wrote:
> > To my regret forcing Vcont to 3.0V or 0V when on external or
> > internal antenna did not make any difference either.
> There goes the easy way out :-(

What if we just test this part by hooking up a 1.5GHz function
generator and then measuring output while applying different voltages?

> Stupid question: did you put the shield back on ?

Well, it needs to be soldered back..

I have just tried to revive GPS on my GTA02v4 by desoldering the
antenna switch and hard-wiring the antenna input to the internal
antenna - with mixed success.
The GPS is now able to sync to the time and it saw one satellite, but
reception is much worse than my 2v5. I didn't solder the shield back
on, though.

Daniel Willmann
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