Re: [time-nuts] Rooftop antenna and splitter
Thanks Mark. For the cost, this seems like a worthwhile thing to try. I don’t think the homeowners association would be too thrilled about a pizza pan on a pole so I’ll probably have to do without. Besides, If I mounted a pizza pan I would also endure endless teasing from from my wife who already thinks I’m insane. :) > On Jan 29, 2019, at 11:44, Mark Sims wrote: > > This is the antenna that I am now using. I do have it mounted over an 18" > pizza pan... I don't know if that does any good, it seemed to work fine > without it. > > https://www.ebay.com/itm/CORS-RTK-GNSS-Survey-Antenna-high-gain-measurement-GNSS-GPS-GLONASS-BDS/253786590956?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649 > ___ > 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.
Re: [time-nuts] Rooftop antenna and splitter
Hi The thing I’m not quite understanding here - why in the world use an antenna that needs a ground plane when you can get one that does not need an external ground plane? I have three multi band GNSS antennas on the back of the house. They all get down to insane error circles (like a mm) according to Opus. None of them have or need external ground planes. The survey guys got away from giant ground planes a long time ago. They seem to be quite happy with the results they get. Bob > On Jan 30, 2019, at 12:47 PM, Mark Goldberg wrote: > > Put a "Bird Feeder" on the side of the house. > > Even only seeing less than 1/2 the sky, this is doing OK with just a > TruePosition L1 GPS, always 7-8 sats. I have room for two antennas on the > ground plane, only have one and am using an HP 58515A active splitter. > > Hopefully the attachment comes through. > > Regards, > > Mark > > > On Wed, Jan 30, 2019 at 10:01 AM Denny Page via time-nuts < > time-nuts@lists.febo.com> wrote: > >> Thanks Mark. For the cost, this seems like a worthwhile thing to try. I >> don’t think the homeowners association would be too thrilled about a pizza >> pan on a pole so I’ll probably have to do without. >> >> Besides, If I mounted a pizza pan I would also endure endless teasing from >> from my wife who already thinks I’m insane. :) >> >> >>> On Jan 29, 2019, at 11:44, Mark Sims wrote: >>> >>> This is the antenna that I am now using. I do have it mounted over an >> 18" pizza pan... I don't know if that does any good, it seemed to work >> fine without it. >>> >>> >> https://www.ebay.com/itm/CORS-RTK-GNSS-Survey-Antenna-high-gain-measurement-GNSS-GPS-GLONASS-BDS/253786590956?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649 >>> ___ >>> 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.
Re: [time-nuts] Rooftop antenna and splitter
Denny Page via time-nuts writes: > Thanks Mark. For the cost, this seems like a worthwhile thing to > try. I don’t think the homeowners association would be too thrilled > about a pizza pan on a pole so I’ll probably have to do without. Use a resonant ground plane with four or eight tuned radials instead, that also has the advantage of way lower wind load… Regards, Achim. -- +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+ DIY Stuff: http://Synth.Stromeko.net/DIY.html ___ 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.
Re: [time-nuts] Rooftop antenna and splitter
Hi Wind load is not a good thing when you are putting things way up in the air on poles. Survival will be much more likely if you don’t have to attach a great big sail to the antenna …. Bob > On Jan 30, 2019, at 11:38 AM, Denny Page via time-nuts > wrote: > > Thanks Mark. For the cost, this seems like a worthwhile thing to try. I don’t > think the homeowners association would be too thrilled about a pizza pan on a > pole so I’ll probably have to do without. > > Besides, If I mounted a pizza pan I would also endure endless teasing from > from my wife who already thinks I’m insane. :) > > >> On Jan 29, 2019, at 11:44, Mark Sims wrote: >> >> This is the antenna that I am now using. I do have it mounted over an 18" >> pizza pan... I don't know if that does any good, it seemed to work fine >> without it. >> >> https://www.ebay.com/itm/CORS-RTK-GNSS-Survey-Antenna-high-gain-measurement-GNSS-GPS-GLONASS-BDS/253786590956?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649 >> ___ >> 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.
Re: [time-nuts] Rooftop antenna and splitter
Just tell your neighbors that you "cut the cord" and it is a new fangled miracle "Digital" amplified UHF TV antenna. Any outside TV antenna falls under the FCC OTARD exceptions, and your homeowners association can't do a thing about it. :) John On 1/30/2019 9:38 AM, Denny Page via time-nuts wrote: Thanks Mark. For the cost, this seems like a worthwhile thing to try. I don’t think the homeowners association would be too thrilled about a pizza pan on a pole so I’ll probably have to do without. Besides, If I mounted a pizza pan I would also endure endless teasing from from my wife who already thinks I’m insane. :) On Jan 29, 2019, at 11:44, Mark Sims wrote: This is the antenna that I am now using. I do have it mounted over an 18" pizza pan... I don't know if that does any good, it seemed to work fine without it. https://www.ebay.com/itm/CORS-RTK-GNSS-Survey-Antenna-high-gain-measurement-GNSS-GPS-GLONASS-BDS/253786590956?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649 ___ 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.
Re: [time-nuts] Rooftop antenna and splitter
On 1/30/19 8:38 AM, Denny Page via time-nuts wrote: Thanks Mark. For the cost, this seems like a worthwhile thing to try. I don’t think the homeowners association would be too thrilled about a pizza pan on a pole so I’ll probably have to do without. Besides, If I mounted a pizza pan I would also endure endless teasing from from my wife who already thinks I’m insane. :) nested cake pans make a nice choke ring, if properly selected for height/diameter. ___ 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.
Re: [time-nuts] Rooftop antenna and splitter
Put a "Bird Feeder" on the side of the house. Even only seeing less than 1/2 the sky, this is doing OK with just a TruePosition L1 GPS, always 7-8 sats. I have room for two antennas on the ground plane, only have one and am using an HP 58515A active splitter. Hopefully the attachment comes through. Regards, Mark On Wed, Jan 30, 2019 at 10:01 AM Denny Page via time-nuts < time-nuts@lists.febo.com> wrote: > Thanks Mark. For the cost, this seems like a worthwhile thing to try. I > don’t think the homeowners association would be too thrilled about a pizza > pan on a pole so I’ll probably have to do without. > > Besides, If I mounted a pizza pan I would also endure endless teasing from > from my wife who already thinks I’m insane. :) > > > > On Jan 29, 2019, at 11:44, Mark Sims wrote: > > > > This is the antenna that I am now using. I do have it mounted over an > 18" pizza pan... I don't know if that does any good, it seemed to work > fine without it. > > > > > https://www.ebay.com/itm/CORS-RTK-GNSS-Survey-Antenna-high-gain-measurement-GNSS-GPS-GLONASS-BDS/253786590956?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649 > > ___ > > 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.
Re: [time-nuts] Rooftop antenna and splitter
On Wed, Jan 30, 2019 at 1:00 PM Bob kb8tq wrote: > Hi > > The thing I’m not quite understanding here - why in the world use an > antenna that needs > a ground plane when you can get one that does not need an external ground > plane? > > What can I say, that antenna was $5.45, locally picked up from the seller, works fine with the TruePosition I didn't pay much for either, and it provides about 10 dB more signal with a ground plane. I'm cheap. I'll admit it. Regards, Mark ___ 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] Rooftop antenna and splitter
I don't know if that Chinese multi-band antenna needs a ground plane/pizza pan. My antenna mount tripod has one handy, so I am using it.My first tests were without the pan and I didn't notice any before/after differences but did not do any extensive testing. The CSRS-PPP position error ellipse results were pretty much the same. ___ 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.
Re: [time-nuts] Rooftop antenna and splitter
On Tue, 29 Jan 2019 21:29:20 +0100 Achim Gratz wrote: > Typically if they already have a ground plane mounted it's between > 6cm…10cm in diameter (or side length if quadratic). Over that size you > shouldn't see much effect anymore on the antenna sensitivity pattern, There is quite a big difference in radiation patterns depending on the size of the ground plane. The back lobes but also the low-elevation sidelobes change quite dramatically when going from 10cm to 20cm to 1m. And even with the 1m antenna, having a sharp edge vs a serrated or curved edge makes again quite a bit of difference for back lobes. On Wed, 30 Jan 2019 20:41:26 +0100 Achim Gratz wrote: > Use a resonant ground plane with four or eight tuned radials instead, > that also has the advantage of way lower wind load… Tuned elements with high Q are definitely not what you want with a GNSS antenna used for precision applications, as they cause large changes in group delay. Keep in mind that the GNSS signal has +/-6kHz of Doppler frequency. Also, having a non-planar ground plane will cause the phase centre to shift depending on the azimuth where the satellite is seen. Again something you do not want with precision applications. Attila Kinali -- Science is made up of so many things that appear obvious after they are explained. -- Pardot Kynes ___ 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.
