Hi David yes its ferro-concrete which makes quite a good screen (a lot worse
than domestic brick) but the windows are not coated I think. (BT Labs at
Martlesham)
Thanks all for some thought stimulating ideas .....GPSDO outside might not
be too easy....1U rack case mains powered....no power available outside but
10MHz (or 5MHz in this case) coupling through wall or window is a lot easier
if I had a battery powered unit.....I have a feeling there may be battery
back-up terminals on it must get the book out.
The windows are SW I think but give a good view of a quadrant of the sky. It
will be interesting to see how long it takes to lock up compared with an
outside antenna.
Thanks and Best Wishes
Alan
G3NYK
----- Original Message -----
From: "David J Taylor" <[email protected]>
To: "time-nuts measurement" <[email protected]>
Sent: Monday, April 08, 2013 7:46 PM
Subject: Re: [time-nuts] GPS antenna??
Hi all an interesting problem you may have encountered, I want to use a
GPS
frequency standard inside a building with no opening windows (opening
windows are known as air conditioning in the UK :-)) )
This is part of a two day amateur microwave conference so we should have
the
expertise.
I intend to try and pass the signal through a a double glazed glass window
unit (hopefully not metalised) using a couple of patch antennas. The outer
GPS antenna is active so will need a 5v supply via an inserter. Inner
patch
active, outer patch passive to avoid problems of feedback. Main antenna
can
be shielded from the "coupling" either physically or with a slab of
absorber.
Has anyone tried this?.... does it work?.....any gotchas?
Thanks
Alan
G3NYK
===================================
Alan,
Here I am on the top floor of a standard house, and get an adequate signal
for today's GPS receivers with simple patch antennas. One GPS I have is
in a walk-in cupboard adjacent to a north-facing outside wall. Obviously,
there are no guarantees, but you may get away with just being adjacent to
an outside wall, or getting the puck near the non-opening window (but that
may be worse than the wall).
If it /must/ be a GPS relay like you are suggesting, perhaps for multiple
receivers inside a room, I can't help. Be sure to place the puck on an
appropriate ground plane - I find a clean, unused baking tray to be
perfect!
73,
David GM8ARV
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: [email protected]
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