I don't think the shield is rated for +/-250V, and I'm not sure I would want
to handle RG-58 with 250V on the shield. If you do this, use triax cable
and ground the outter shield, and make sure the breaker can interrupt the
fault current (if the fault currrent is in the hundreds, or even tens of
Amps then this would not be a good idea).
Bob
----- Original Message -----
From: "Christian Vogel" <vogel...@vogel.cx>
To: "Yuri Ostry" <y...@ostry.ru>
Cc: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Friday, June 18, 2010 8:30 AM
Subject: Re: [time-nuts] Galvanic decoupling of GPS antenna
Hi Yuri,
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).
I don't see any need for isolation in the signal chain as long as your
antenna and cable are properly insulated. I have a fully sealed antenna
here on a Thunderbolt and nothing -with exception of the BNC connector
at the cable end- exposes the system ground. So I could easily float
the TBolt and connected PC at +250V without anyone "outside" noticing.
Chris
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