[time-nuts] Galvanic decoupling of GPS antenna

Robert Benward rbenward at verizon.net
Fri Jun 18 09:13:11 EDT 2010


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" <vogelchr at vogel.cx>
To: "Yuri Ostry" <yuri at ostry.ru>
Cc: "Discussion of precise time and frequency measurement" 
<time-nuts at 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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