Yuri,
Why don't you get a small GPS and keep it with the antenna, and isolate the
digital side of the GPS with opto couplers? Supply power to the GPS, and
the GPS supplies power to the antenna. Optically couple the digital side to
your controller. The RF transformer you might come across are probably not
rated for isolation purposes, especially at +/-250V
Bob
----- Original Message -----
From: "Yuri Ostry" <[email protected]>
To: <[email protected]>
Sent: Wednesday, June 16, 2010 5:09 PM
Subject: [time-nuts] Galvanic decoupling of GPS antenna
Hello,
I'm trying to put gps (for a coarse timing sync and RTC
auto-setting) to a small controller that must be completely
galvanically decoupled from outside world. Antenna power must be
supplied from separate power source (ground potential of isolated part
of circuit can slowly float up to +/- 250 volts referenced to ground
of antenna power supply).
First thinked about using some choke to inject power, then DC-blocking
capacitor around 20-30 pf and then smt 1:1 wideband transformer, but
looks like Mini-Circuits don't make standard models for frequencies
over 1200 MHz, their search engine give me some part numbers that looks
like special order ones, and cannot be found in their catalog.
Is there any chances to get decent performance if I'll simply split
stripline (both ground and signal traces) by dc-blocking caps? Idea
looks not very good to me, of course, I suspect that i'll get all
sorts of interference right to GPS LNA input...
Maybe there is some well proven solution with easily obtainable parts?
--
Sincerely,
Yuri mailto:[email protected]
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