Re: [time-nuts] GSM/GPRS module timing accuracy

I am in Australia and the accuracy of the NITZ service can be slow by up to 15 SECONDS. I have no idea why it is so bad. You can try this for yourself. Just get a GSM modem connected to your laptop, set it up to accept NITZ updates and print the results on the serial port, and take a drive around y

Re: [time-nuts] GSM/GPRS module timing accuracy

On 11/11/2014 21:52, Tom Harris wrote: How are you getting time from the GSM network? If you are using the NITZ (look it up) service then you can use an unactivated SIM for free, but the accuracy is woeful, it can be seconds out. I'm not at the moment; mobile phones do set their clocks from the

Re: [time-nuts] GSM/GPRS module timing accuracy

How are you getting time from the GSM network? If you are using the NITZ (look it up) service then you can use an unactivated SIM for free, but the accuracy is woeful, it can be seconds out. Else you will have to have a live SIM and use NTP to a server. If you make any progress please post to the

[time-nuts] GSM/GPRS module timing accuracy

How accurately can you set, and keep in sync a local clock (in the UK) by getting timing from a cellular network using a very low cost GSM/GPRS modem module such as a SIM900? Is it possible to get better than hundreds of microseconds for example, perhaps even a few tens of us? How frequently ca