[time-nuts] Best location for a GPS antenna...?
lists at rtty.us
Thu Apr 12 16:41:51 UTC 2012
GPS is pretty close to the noise "as received". A fully passive system with
significant cable loss and low / no gain antennas does not sound like it's
going to do a very good job.
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Jim Lux
Sent: Thursday, April 12, 2012 9:52 AM
To: time-nuts at febo.com
Subject: Re: [time-nuts] Best location for a GPS antenna...?
On 4/12/12 2:09 AM, Rob Kimberley wrote:
> There are commercial "re-radiators" for GPS. I found these on Google:
> One of my old suppliers in the UK was marketing a range of these, but I
> to remember some problem in getting approval in the UK, and they had to
> them. Things may have changed as this was a few years ago.
Interestingly I've just been looking into this... Why would you need
anything special to reradiate.. It's not like you need a particular
antenna pattern or constant gain or something. What about something like
a fat monopole against a ground plane, with a attenuator at the feed to
provide a good terminating impedance for the LNA/Line driver.
If it's L1 only, you don't even need particularly wide bandwidth (<1%)
Yes, I've seen setups at JPL where they reradiate with D&M or Ashtech
chokering antennas (or even helibowls), but that might be because we've
got a bunch of them sitting around, so why not use it.
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