[time-nuts] GPS shielding by power lines?
Didier Juges
didier at cox.net
Sun Aug 10 13:51:50 UTC 2008
Alan,
I recommend you look for an HP 58532A. I bought a brand new one on eBay for
$50 BIN, sometimes you can do better. This is a good timing-grade antenna,
and intended to stay outside for a long time. They have good filtering and
the LNA is shielded.
Didier KO4BB
> -----Original Message-----
> From: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Alan Melia
> Sent: Sunday, August 10, 2008 8:17 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] GPS shielding by power lines?
>
> 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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