If the satellite is above the mask, the signal will be used in computing a solution even if it got in through reflexions and multipath. That's why a good antenna with choke rings is desirable.
Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -----Original Message----- From: Azelio Boriani <[email protected]> Sender: [email protected] Date: Tue, 3 Apr 2012 21:27:26 To: Discussion of precise time and frequency measurement<[email protected]> Reply-To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] Antenna for t-bolt Of course the elevation mask is only software and doesn't prevent the bad signal from entering the antenna but then the signal will not despread and should cause no harm to the computations. On Tue, Apr 3, 2012 at 9:19 PM, <[email protected]> wrote: > The elevation angle filter is based on the satellite position, not the > actual direction the signals come from. > > If you have reflections and multipath, but the satellite is otherwise high > in the sky, you are out of luck regardless of elevation angle filter. > > Of course, the higher the sat, the less likely you will have reflections > from roofs and such, so it is definitely not useless, but it is not the > same as having a good antenna in the first place. > > Didier KO4BB > > ------Original Message------ > From: Hal Murray > Sender: [email protected] > To: Time-Nuts > ReplyTo: Time-Nuts > Subject: Re: [time-nuts] Antenna for t-bolt > Sent: Apr 3, 2012 12:15 AM > > > [email protected] said: > > Presumably a timing antenna would block low elevation signals to reduce > > multipath. > > Maybe, but there is a software aspect to the filter. You get to select the > elevation angle. > > I don't remember seeing any specs about the filtering angles of various > antennas. Has anybody seen something like that? > > > -- > These are my opinions, not necessarily my employer's. I hate spam. > > > > > _______________________________________________ > 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. > > > Sent from my BlackBerry Wireless thingy while I do other things... > _______________________________________________ > 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. _______________________________________________ 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.
