[time-nuts] Galvanic decoupling of GPS antenna
rfnuts at arcor.de
Thu Jun 17 01:09:39 UTC 2010
So you're having something like that in mind?
4...2400 MHz / 1000V
Yuri Ostry schrieb:
> Thursday, June 17, 2010, 2:44:43, Didier Juges wrote:
> D> It is not clear to me why the antenna should be isolated from the
> D> receiver, I would prefer to keep the antenna and receiver on the
> D> same return, and isolate that assembly from the rest of the world.
> D> It is much easier to provide isolation on the supply, RS-232 and
> D> 10MHz (if you use it) than on the antenna, in my opinion, at least
> D> as much as it is less likely to have a negative performance impact,
> D> and you can do it with off-the-shelf parts.
> Too long story to explain it now. I have very limited power available
> on those what named "outside world" here. Just enough to "feed" some
> low-power active GPS antenna (I can allocate approx 15 ma @ 3.6V).
> In addition, whole design is battery powered, so it will be
> difficult to allow extra 30-40 ma for DC-DC converter module
> quiescent current. ;)
> > From my first look it was a good idea to isolate antenna (and maybe
> even consider passive antenna if tests will show that there is enough
> gain) and make a full use of low-power features of that tiny uBlox
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