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" <[EMAIL PROTECTED]> To: "'Discussion of precise time and frequency measurement'" <[email protected]> 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
