Re: [time-nuts] Number of GPS sats in the sky?

HI http://www.gps.gov/systems/gps/space/ 27 Sats in the sky. Since their altitude is about 2 earth radii, they aren’t height enough to cover a full “half earth” at one time. Bob > On Jul 9, 2015, at 7:06 PM, Bob Stewart wrote: > > Thanks Chris and everyone else who responded. I just didn't

[time-nuts] Number of GPS sats in the sky?

The GPS system is pretty much limited to 32 active satellites. There are currently 29 satellites broadcasting usable navigation data. Plus some WAAS signals from geosynchronous orbit. ___ time-nuts mailing list

Re: [time-nuts] Number of GPS sats in the sky?

b...@evoria.net said: > Is there a practical limit to the number of GPS sats overhead at any one > time? I think there is a 5 bit field for the satellite number in some of the packet formats. You are unlikely to see more than half of them. I think they actually have more than 32 satellites up

Re: [time-nuts] Number of GPS sats in the sky?

Thanks Chris and everyone else who responded.  I just didn't know what to look for.  The full 36 shouldn't take up all that much memory. Bob From: Chris Hoffman To: Bob Stewart ; Discussion of precise time and frequency measurement Sent: Thursday, July 9, 2015 5:48 PM Subject: Re: [ti

[time-nuts] CS frequency standard

I lucked out on a very squeaky clean FTS 4060 CS standard. Started up right away and appears to have a strong tube. My question for those in the know: I don't appeal to the standard very often. Should I leave it on all the time, on a UPS, or start it up when I need it? I'm 76. If I leave it on, wil

Re: [time-nuts] Number of GPS sats in the sky?

Hi If you are talking about GPS only, *and* a rational altitude *and* a rational elevation mask … 12 should be a pretty good max number. Bob > On Jul 9, 2015, at 1:54 PM, Bob Stewart wrote: > > Is there a practical limit to the number of GPS sats overhead at any one > time? I ask this beca

[time-nuts] Number of GPS sats in the sky?

Is there a practical limit to the number of GPS sats overhead at any one time? I ask this because I'd like to start parsing this info from my ublox receiver and need to setup an array for the values.  Memory is not unlimited on my PIC. Bob - AE6RV ___

Re: [time-nuts] Reeeely long term HP 5065A drift rate (13 year!)

So interesting they do circle around the same region. Pretty amazing. Regards Paul WB8TSL On Wed, Jul 8, 2015 at 1:39 PM, wrote: > A few have volunteered for extended tests! > > Also got some info for a couple others: > > Unit 1 3.15X10-12/Year 12 years > Unit 2 1.53X10-12/Year 13 Years > Unit 3