[time-nuts] Tbolt with Palisade
grant at ghengineering.co.uk
Thu Jan 22 13:25:00 EST 2009
The antenna will be mounted outside with a reasonably clear view to the
horizon from east-south-west. But there are times when there could be a
lot of RF in the area - I design and build high power VHF and UHF PAs,
amongst other things, and one of the attractions of the quality GPS
antennas is the fact that they have a built in filter.
But I might try one of the cheap patch antennas as a start with a view
to upgrading at some point in the future.
Nigel Wrote :-
> Hi Grant
> I think this really does depend on where you are, satellites in view etc,
> and what level of performance you're actually looking for.
> I have a few different timing antennas but have found these don't give very
> reliable reception indoors.
> Until I can get these mounted outdoors I have been having good results on
> various receivers using some small Trimble magnetic patch antennas, specified
> 26dB gain, attached to a steel plate and sitting on a shelf inside a one level
> timber framed house on the west coast of Scotland.
> These came via a buy it now from the usual place at $21 for 10 about a year
> Driving a pair of Thunderbolts with these and comparing them with an HP
> 53132A counter, either one as reference and the other as input, once locked I see
> variations of just a few places around zero in the 10th decimal place.
> I have used this test on any two units selected from four with consistent
> Not a very scientific test perhaps, and nothing else measured, but as
> regards frequency at least I don't think they're suffering too much from their
> "lesser" antennas:-)
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