[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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