Hi > On Jul 17, 2016, at 2:35 AM, David J Taylor <[email protected]> > wrote: > > The GPS Antenna Micropulse Z1001 appears to be what is now designated > GPS-TMG-26N > > Lester B Veenstra MØYCM K1YCM W8YCM > [email protected] > ______________________________________ > > 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. Bob > > David > -- > SatSignal Software - Quality software written to your requirements > Web: http://www.satsignal.eu > Email: [email protected] > Twitter: @gm8arv > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
