[time-nuts] GPS Antenna

Bob Camp kb8tq at n1k.org
Sun Jul 17 10:22:49 EDT 2016


> On Jul 17, 2016, at 2:35 AM, David J Taylor <david-taylor at blueyonder.co.uk> wrote:
> The GPS Antenna Micropulse Z1001 appears to be what is now designated GPS-TMG-26N
> Lester B Veenstra  MØYCM K1YCM W8YCM
> lester at veenstras.com
> ______________________________________
> Why is the noise figure so high on these antennas (2.5 dB)?  Is that some pre-filtering, perhaps?

They are designed as timing antennas. That normally puts them in a “lots of RF” environment. 
(like a cell tower). They should have some filtering in front of the preamp and a preamp that is
fairly good for IMD. There has always been a lot of debate about this or that one *actually* having
improved performance in these respects. 


> David
> -- 
> SatSignal Software - Quality software written to your requirements
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> Email: david-taylor at blueyonder.co.uk
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