Discussion in 'Amateur Radio News' started by OH8STN, Oct 18, 2019.
If you've ever wanted to use a Raspberry Pi off grid & without internet, for ham radio data modes like WSPR, FT8, FT4, JS8, ... I've published a new tutorial for setting up a real-time clock in your Raspberry Pi.
You are very welcome.
Excellent! Thanks Julian!
I am using something like this here at the QTH for time keeping. http://unixwiz.net/techtips/raspberry-pi3-gps-time.html
I've only quickly scanned through the video but did you use a GPS as well ? An RTC will eventually drift without constant time correction. It might only be .25 seconds per day but it will be too far out of sync quite quickly otherwise. A GPS is a good permanent solution as it can extract an accurate clock as long as it can see the satellites.
I used PI's with RTC's in the past just to cover the gap when network time via NTP was not available.
I've considered adding stratem
Ok, perhaps not a very thorough scan. Augmenting the GPS with an RTC, was mentioned within the first minute of the video. The GPS is an excellent reference, but requires some time to acquire satellites before updating the clock. The real time clock provides accurate time instantaneously upon boot, augmentingthe HPS while waiting for acquisition. If it's out of sync, the GPS will update it, once satellite acquisition happens. They are definitely better in combination, than individually.
Internet NTP is easy, but as mentioned in the video, getting operators to be less dependent on the grid, makes them better prepared for grid down scenarios as in California, or Manitoba.
Very good tutorial OM.
Keep up the good work.