[time-nuts] GPS shielding by power lines?

Alan Melia alan.melia at btinternet.com
Sun Aug 10 13:16:31 UTC 2008


Hi Didier, thanks for that idea, yes they were all "pucks" all Garmin two
intended for marine use and one was a old Garmin GPSIIplus with a  mag
"puck". I have a Trimble Palisade that I have not got round to working on
yet, but I understand that there are problems putting this version into NMEA
mode...so will have to be careful.

 Thanks Alan G3NYK

----- Original Message -----
From: "Didier Juges" <didier at cox.net>
To: "'Discussion of precise time and frequency measurement'"
<time-nuts at febo.com>
Sent: Sunday, August 10, 2008 12:52 PM
Subject: Re: [time-nuts] GPS shielding by power lines?


> Alan,
>
> I don't believe you have said what type of antenna you are using. If you
are
> using a true timing antenna (Symmetricom, Trimble Bullet) I would expect
> little or no direct effect from the power lines, but if you are using a
puck
> or other inexpensive commercial antenna (which have little or no filtering
> or shielding), you may well be affected directly by the field from the
power
> line on the antenna itself. The Thunderbolt itself should have enough
> filtering to protect you from a direct effect, the Thunderbolt has been
> designed to be co-located with other equipment, particularly cell
> transmitters, so I would expect it to be fairly immune to stray fields.
>
> Didier KO4BB






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