In theory at least, a single satellite is enough to provide timing in position hold mode.
However, that assumes you get a direct line-of-sight signal, with no multipath. A reflected signal has additional delay that the GPS receiver cannot factor out if it's receiving only one satellite. If it is receiving many, it *might* be able to tell which ones have multipath delays and ignore them. A high antenna tends to have good line-of-sight reception of the satellites, as well as receiving more of them. The former might be more important than the latter. Dave 2011/9/12 Miguel Gonçalves <m...@miguelgoncalves.com>: > Hi Chris! > > Here and on ntp-questions always helping me out! Thanks! > > Moving it up to the roof would be difficult. Would have to talk to all > neighbours to ask permission to run a cable to the roof. I'll have to keep > it at this location. > > Anyway, in position hold I would assume that using 2 satellites will give me > good time. Right? > > Thanks again! > > Cheers, > Miguel > > On 12 September 2011 16:03, Chris Albertson <albertson.ch...@gmail.com>wrote: > >> 2011/9/12 Miguel Gonçalves <m...@miguelgoncalves.com>:.. >> > oncore# /var/tmp/sats.sh >> > 8 satellites: 0 >> > 7 satellites: 0 >> > 6 satellites: 870 >> > 5 satellites: 7941 >> > 4 satellites: 7313 >> > 3 satellites: 6385 >> > 2 satellites: 575 >> > 1 satellites: 0 >> > >> > The machine has been running for 6 hours and it has been seeing a good >> > number of satellites for most of the time. >> > >> > Do you think I should buy an external antenna ..... >> >> >> It looks like your current antenna can only see about 1/2 of the sky. >> The reason to replace it is so you can see the entire sky. the >> Panasonic would be ideal because it has enough gain to drive a long >> cable. THere is no resin to replace the antenna unless you intend >> to place it in a better location. A higher gain at the same >> location will not give you a better view of the sky. >> >> Any outdoor antenna needs to be pointed or have a dome shape so that >> whatever falls on it rolls off. >> -- >> >> Chris Albertson >> Redondo Beach, California >> >> _______________________________________________ >> 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. > _______________________________________________ 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.