On 4/12/12 2:09 AM, Rob Kimberley wrote:
There are commercial "re-radiators" for GPS. I found these on Google:
<http://www.gps-repeating.com/?gclid=COTV88D6rq8CFcwTfAodhSKvmQ>
<http://gpsnetworking.com/GPS-re-radiating-kits.asp>
One of my old suppliers in the UK was marketing a range of these, but I seem
to remember some problem in getting approval in the UK, and they had to drop
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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