[time-nuts] Tbolt with Palisade?

Robert Atkinson robert8rpi at yahoo.co.uk
Mon Jan 19 02:46:39 EST 2009


Hi Grant,
Keep the Palisade as it is. It's got a useful 1 PPS output. Also it's almost impossible to open the case without destroying it. The two halves are epoxyed together with a very good joint geometry! There is no obvious way to get to the antenna output. If you want to hack something, have a look for one of the Vaisalla GPS radiosondes. They have a nice Bi-Helix antenna, LNA and filter. But even a simple patch on a ground plane will do.

Robert G8RPI.


--- On Sun, 18/1/09, Grant Hodgson <grant at ghengineering.co.uk> wrote:

> From: Grant Hodgson <grant at ghengineering.co.uk>
> Subject: [time-nuts] Tbolt with Palisade?
> To: time-nuts at febo.com
> Date: Sunday, 18 January, 2009, 8:32 PM
> Does anybody know how difficult it would be to use just the
> antenna + 
> LNA part of a Trimble Palisade?  Have Tbolt but no antenna.
> I can get a 
> Palisade for much less than a proper GPS antenna.  Coax
> length would be 
> about 20 feet, connected to the output of the
> Palisade's LNA (or output 
> filter if fitted).
> 
> Only possible problem I envisage is that the Palisade LNA
> will probably 
> have less gain than say a 58532A.  However, the latter is
> designed for 
> long cable runs; I'm guessing that this unusual
> arrangement might work 
> with a fairly short cable run.  Powering the Palisade LNA
> shouldn't be 
> too difficult me thinks.
> 
> regards
> 
> Grant
> 
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