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

On Sun, 2009-01-18 at 20:32 +0000, Grant Hodgson wrote: > 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). Does the Palisade have an LNA at the antenna? Since it is an integrated receiver antenna construction, I would imagine they use a passive antenna. And you have no ready to use coaxial connector to the Palisade housing. Is it worth your time? Why not take a small mag-mount antenna (++many available at sub $10 at an online auction site close to you.) They usually have up to about 5 meters of thin coax (RG174 or equiv.). -- Björn

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@ghengineering.co.uk> wrote: > From: Grant Hodgson <grant@ghengineering.co.uk> > Subject: [time-nuts] Tbolt with Palisade? > To: time-nuts@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 > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.