I use a small power supply to feed the antenna (use a bias tee) and a DC block for the analyzer input. I have made a quadrifilar helix for the analyzer output. Set a suitable frequency range (1400-1700) and test. Yes, I have (at work) an analyzer with the S-parameter test set, so that no directional coupler and no problems, moreover I have new antennae to test to make comparisons but the results are clearly visible and you can recognize a defective antenna. Usually customers send in questionable antennae and we can tell weather or not they are really unusable: lightning is the killer.
On Mon, Jul 30, 2012 at 9:54 PM, Chuck Harris <cfhar...@erols.com> wrote: > Hi Azelio, > > How would you use a network analyzer to test an active antenna > like these? I have the ANA, but I am not sure how to couple > the input to the antenna effectively. > > -Chuck Harris > > Azelio Boriani wrote: > >> Have you any other GPS unit to test your antennae? You can test GPS >> antennae with a network analyzer or a spectrum analyzer with the tracking >> generator... yes, first you have to find one. >> >> On Mon, Jul 30, 2012 at 5:12 PM, Hal Murray <hmur...@megapathdsl.net> >> wrote: >> >> >>> cfhar...@erols.com said: >>> >>>> I suspect that I have just had the bad luck to buy two bad antennas, but >>>> >>> I >>> >>>> am naturally curious what happens when the sample set gets larger. >>>> >>> >>> I have 2 TBolts using the small Motorola antenna from TAPR in a not-good >>> location. The sheet says 24 dB of gain. I have 6 or 9 or ?? feet of >>> RG-6. >>> >>> They work as expected, that is they work, but not well. The holdover >>> logic >>> gets tested frequently and surveys take a long time. But they do work. >>> >>> -- >>> These are my opinions. I hate spam. >>> >> > _______________________________________________ > 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. > _______________________________________________ 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.