Hi The pictures shown earlier are of a “survey antenna”. In the post I was careful to refer to a “survey antenna” as the point of the post. Ideally you want to be meters away from any metal.
Bob > On Apr 30, 2019, at 5:42 PM, Taka Kamiya via time-nuts > <time-nuts@lists.febo.com> wrote: > > I can see that on survey situation but will it affect timing installations? > Will you give me an idea how far those bullet type antenna needs to be? My > antenna sits on a very short pole (2 feet?) and its base is mounted to frame > of my screened in porch. Roof and structure is aluminum, which is very much > like ground plane and reflective. > > --------------------------------------- > (Mr.) Taka Kamiya > I'm stuck in a wormhole.... Hello, worms! > > On Tuesday, April 30, 2019, 5:01:05 PM EDT, Bob kb8tq <kb...@n1k.org> > wrote: > > Hi > > You very much do *not* want to put a ground plane on one of the modern survey > antennas.(Chinese or US or Canadian or …) The better ones are very explicit > about this. They are optimized to sit on a pole in free air. Anything else > and the > pattern is degraded. ( = multipath gets worse) > > Bob > >> On Apr 30, 2019, at 2:23 PM, David J Taylor via time-nuts >> <time-nuts@lists.febo.com> wrote: >> >> Hi David, >> >> No, no ground plane. Don’t really have a lot of room for that in the window. >> Out of curiosity, how large of an impact have you found with a ground plane? >> >> Btw, I love the pan! >> >> Denny >> ============================ >> >> Yes, Denny, choosing the baking tray (IIRC) was fun - I wanted as large a >> flat area as I could reasonably get, but it has to be magnetic. I don't >> recall what I took into the shop to test with! >> >> Unfortunately I didn't make any specific measurements with and without the >> ground plane, but I did see a noticeable increase in SNR. Even a small e.g. >> tobacco tin may help. >> >> Cheers, >> David >> -- >> SatSignal Software - Quality software for you >> Web: http://www.satsignal.eu >> Email: david-tay...@blueyonder.co.uk >> Twitter: @gm8arv >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
