Re: [time-nuts] Regarding the 00105-60xx (Bringing a 5065A back to life)

Hi If you do decide to go with the 105 OCXO’s in your 5065A, you probably will need to test the samples you have on hand. The selection process that sorted them into groups took place before many Time Nuts were born. Over that sort of time period, stuff drifts and (possibly) gets better. Even

Re: [time-nuts] GPS seconds conversion on an Arduino

Hi Chris and list, My original goal was to duplicate, more or less, what the PackRat guys did to get the TruePosition boards up and functional as described here: I did get in touch with them and they forwarded the HEX

Re: [time-nuts] Regarding the 00105-60xx (Bringing a 5065A back to life)

Hi Ulf, in the 10811 version HP mount the 10811-60109, a 10MHZ oscillator with a TTL divider by two to obtain 5MHz as the original circuit require. The chassis and front panel are the same in the 00105 and 10811 version. please see the picture below:

[time-nuts] Regarding the 00105-60xx (Bringing a 5065A back to life)

  What I wanted to know was the differences (specs) betweensome of the 00105 oscillator modules in order tomount the best one in the 5065A which I am trying tobring back to life. I have a bunch of 10811assy:s and thereare differences in drift, phase noise, etc. Thecoarse frequency adjustment

Re: [time-nuts] GPS seconds conversion on an Arduino

On Sun, May 14, 2017 at 9:15 AM, Nick Sayer via time-nuts wrote: > > I wouldn’t expect floating point to enter into it. The question here was about conversion to Siderial Time. The mean sidereal day is 23.9344699 hours but that is the MEAN. The length of the day

Re: [time-nuts] GPS seconds conversion on an Arduino

Unless this is an educational exercise I'd move to a different processor. One of those $3 Arm M3 units has enough memory AND a more standard development environment that you could use a standard library function to do what you need. For more money ($13) you can get the Arm M4 on an arduino-like

Re: [time-nuts] GPS seconds conversion on an Arduino

The goal I had was to convert GPS to UTC to minutes from 1980 to create the wwvb time message. Much of it was reasonable but then the funnies came in. The WWVB contains a part of the message that says DST is coming and dst is here.. Tables took care of that nicely. I used 64 bit words because that

Re: [time-nuts] GPS seconds conversion on an Arduino

I wouldn’t expect floating point to enter into it. Add the leap second correction in, then take seconds modulo 86400 and you get the second-within-the-day. Divide seconds by 86400 and you get the day number. With the day number, it’s quite straightforward to figure out gregorian date given a 0

Re: [time-nuts] GPS seconds conversion on an Arduino

On Sun, May 14, 2017 at 9:25 AM, Ben Hall wrote: > I think I can make the process work *if* the time library doesn't hold the > answer. (and I think it does) The Arduino Time library can convert back and forth between numeric year/month/day/hour/minute/second and a uint32

Re: [time-nuts] GPS seconds conversion on an Arduino

Mark, Ben, Paul, 32-bit integers is sufficient. Use days instead of seconds. Use MJD instead of JD. Here's an example: Step 1, convert calendar date to MJD, and then to GPS day: // Convert year, month (1-12), and day (1-31) to Modified Julian Day (MJD). // Adapted from sci.astro FAQ (valid for

Re: [time-nuts] GPS seconds conversion on an Arduino

On 5/13/17 6:58 PM, Mark Sims wrote: Converting GPS seconds to Gregorian date/time on the Arduino will be an arduous task. You take GPS seconds and add it to the GPS starring epoch to get a Julian date. Then add in the number of leap seconds as a fraction of a day to get UTC and possibly

Re: [time-nuts] GPS seconds conversion on an Arduino

I went through much the same thing withe the wwvb cheatn d-psk-r. The date and time format is integer minutes since 1980 as I recall. Long longs are my friend. Think I used even bigger. But I ended up with leap second tables and leap days. It really is complicated. But you learn a lot in the

Re: [time-nuts] GPS seconds conversion on an Arduino

On 5/14/2017 5:24 AM, Magnus Danielson wrote: You don't need to boil everything into one single number before decomposing it into another form. If you start with the years, well, the different sums at most offset you by 1 as you branch to the next year at somewhat misaligned dates. Similar

Re: [time-nuts] GPS seconds conversion on an Arduino

Hi Mark, You don't need to boil everything into one single number before decomposing it into another form. If you start with the years, well, the different sums at most offset you by 1 as you branch to the next year at somewhat misaligned dates. Similar with GPS weeks etc. If you think it

[time-nuts] GPS seconds conversion on an Arduino

Converting GPS seconds to Gregorian date/time on the Arduino will be an arduous task. You take GPS seconds and add it to the GPS starring epoch to get a Julian date. Then add in the number of leap seconds as a fraction of a day to get UTC and possibly add in a time zone offset for local time.