>
> You can also fix your software to add 1024 weeks until the date is past a
> magic constant. If your tools support it, you can get that date as the
> build
> date from when you compiled your software.
>
Then there's US patent 5,923,618: "Leap-second cure for 1999 GPS rollover
problem"
The aut
Depending on who’s GPS chipset is being used, a fix might be possible. I’ve
poked around inside the firmware of a number of Trimble receivers (so far three
generations of the 4000 series, and the Placer series). Because the first week
rollover occurred in 1999, any receiver made close to that da
Skip,
I’m envious! Fantastic write up, and I look forward to updates. I find it
fascinating that the once-master clock for the DSN was constructed using
techniques familiar—at least for the electronics package—to most amateur radio
folks.
What does the future hold for this unit? Is it going to
I was pondering this recently. But then I realized something: Sure, something
like this would eliminate the transformer… in your house. But there’s still a
transformer out on the street somewhere, then another in a substation
somewhere, then another in a bigger substation somewhere, then another
For the curious, the source for this is here:
https://web.tapr.org/~n8ur/PIC_Code/
When I read that it uses a only a PIC, I was skeptical, but then when I read
that jitter is in the range of 1 pico second, I was intrigued. It’s a neat
solution, the 10 MHz input signal is used as the clock for
I still feel like an important point is being overlooked here: The receiver
can not directly tell where in the sky the satellite is. It's impossible to
determine that from a single point of observation. All the receiver can
discern is the distance to the satellite. The sky plot is a prediction, not
Internet Archive to the rescue!
https://web.archive.org/web/19990506093727/http://www.isotemp.com/ocxo59.htm
According to that page, the OCXO59 series is available in 5 MHz to 50
MHz... So a 1MHz version may have been an OEM version.
>From a later archive of their site, here's a PDF datasheet fo
At the risk of sounding like an old fart: one of the ye olde fashioned 18 pin
PIC microcontrollers can easily do what you’re trying to do without having to
resort to a full blown RTOS.
For the longest time my “logic analyzer” was a PIC with a bit banged 57600 baud
serial port. To get the sampl
