Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

> Multipath on GPS normally requires a couple of things: > > 3) The signal path length has to be close enough that the normal firmware > does not reject > the solution. > Expanding on this a bit, because it's relevant to the "aircraft causing multipath" question, the pseudo random noise

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

On Wed, 25 May 2016 09:59:33 -0500 David wrote: > I was designed as a transmitter hunting antenna sacrificing size and > gain for minimum side lobes. You can see a photo of it on the front > cover of October 1995 73 magazine. For those who are also wondering what it looks

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

On Wed, 25 May 2016 19:33:37 +0200, you wrote: > >> Le 25 mai 2016 à 16:59, David a écrit : >> >> I was designed as a transmitter hunting antenna sacrificing size and >> gain for minimum side lobes. > >I’ve got to see your selfie. It was not a selfie. Joe Moell, K0OV,

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

> Le 25 mai 2016 à 16:59, David a écrit : > > I was designed as a transmitter hunting antenna sacrificing size and > gain for minimum side lobes. I’ve got to see your selfie. "The power of accurate observation is commonly called cynicism by those who have not got

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

On Wed, 25 May 2016 06:34:46 -0700, you wrote: >On 5/24/2016 7:26 PM, David wrote >>The 2 meter >> directional antenna I ultimately designed was good enough to not only >> track airlines by their reflected RF, but it could see reflections and >> shadows from nearby objects like street lights

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

On 5/24/2016 7:26 PM, David wrote The 2 meter directional antenna I ultimately designed was good enough to not only track airlines by their reflected RF, but it could see reflections and shadows from nearby objects like street lights and trees which ultimately limited outside performance

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

- From: billriches Sent: Wednesday, May 25, 2016 5:34 AM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes) Reminds me of the 1950's living in Wildwood, NJ. We had a TV antenna on the roof to pick up stations

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

Hi Multipath on GPS normally requires a couple of things: 1) The satellite you are trying to lock on to needs to be obscured. Being below the local horizon is one normal way for this to happen. 2) The satellite signal needs to be reflected off of something that does not put in enough

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

[mailto:time-nuts-boun...@febo.com] On Behalf Of David Sent: Tuesday, May 24, 2016 10:26 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes) On Tue, 24 May 2016 16:15:15 -0700, you wrote: > >kb...@n1k.or

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

On Tue, 24 May 2016 16:15:15 -0700, you wrote: > >kb...@n1k.org said: >> The glitches are to narrow (short duration) and far to regular for the >> ionosphere to be the issue. > >Is multipath from a large airliner in a landing pattern likely to cause that >sort of problems? > >I'm 20+ miles off

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

HI The gotcha with anything local is the sidereal day repeat pattern The local stuff would have to be very solar oriented to be slipping at exactly that rate over a few months of data. My guess is that when *this combo* gets into *that position* and *this multi path* happens … you get a

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

kb...@n1k.org said: > The glitches are to narrow (short duration) and far to regular for the > ionosphere to be the issue. Is multipath from a large airliner in a landing pattern likely to cause that sort of problems? I'm 20+ miles off the end of SFO, but it's common to see large planes

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

HI If you have a good antenna location and always have more sat’s in view than the receiver can use, the constellation shift may not be a big deal at some level. No matter how good the antenna, day / night ionosphere compared to the estimated numbers they broadcast will be an issue. Is the

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

of each GPS SV. /tvb - Original Message - From: "Magnus Danielson" <mag...@rubidium.dyndns.org> To: <time-nuts@febo.com> Cc: <mag...@rubidium.se> Sent: Monday, May 23, 2016 11:57 PM Subject: Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes) >

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

3:43 PM Subject: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes) Hello Nuts, I am attaching a capture from Lady Heather of a 3-day run. You can see the temperature vary by 7C over each day. The TB is being run open loop and another GPSDO 10MHz input to the unit instead of the unit

[time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

Lady Heathe does have sidereal time support. Set the time zone name to LMST or GMST or LAST or GAST and you get sidereal times... ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

Hi Skip: The GPS orbit is 12 sidereal hours. It sure would be nice if LH supported that time frame. The ground track repeats for each satellite, so LH could also have a separate elevation mask for each of them. -- Have Fun, Brooke Clarke http://www.PRC68.com

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

ia at lat/lon > +39/+104. > 3) Tomorrow evening at 6 PM MDT that same pattern will again be in the > sky, this time for you in Denver. > > /tvb > > - Original Message - > From: "Skip Withrow" <skip.with...@gmail.com <javascript:;>> > To: &quo

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

if these predictions sort of match what you actually observe. /tvb - Original Message - From: Peter Marczinowski To: Tom Van Baak ; Discussion of precise time and frequency measurement Sent: Monday, May 23, 2016 6:01 PM Subject: Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

orrow evening at 6 PM MDT that same pattern will again be in the sky, this time for you in Denver. /tvb - Original Message - From: "Skip Withrow" <skip.with...@gmail.com> To: "time-nuts" <time-nuts@febo.com> Sent: Monday, May 23, 2016 3:43 PM Subject: [tim

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

Hi Well, *maybe* there is a 24 hour component in the GPS constellation :) Indeed a lot of stuff repeats at the 24 hour point. The ionosphere is a bit different at midnight than at noon. Bob > On May 23, 2016, at 6:43 PM, Skip Withrow wrote: > > Hello Nuts, > > I am

[time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

Hello Nuts, I am attaching a capture from Lady Heather of a 3-day run. You can see the temperature vary by 7C over each day. The TB is being run open loop and another GPSDO 10MHz input to the unit instead of the unit's oscillator. I expected the purple line to repeat every 12 hours based on