[time-nuts] Is it sensible to update every few seconds from NTP server?

Bob Camp lists at rtty.us
Thu Nov 8 00:57:17 UTC 2012


Hi

I think you would do a lot better with a cheap GPS rather than fiddling with NTP for this level of timing. No real need for a GPSDO, just the raw pps and time of day straight out of the GPS. Probably no need for a timing grade GPS, just one with a PPS.

Bob

On Nov 7, 2012, at 6:47 PM, David Kirkby <david.kirkby at onetel.net> wrote:

> On 7 November 2012 23:28,  <bjones0 at mindspring.com> wrote:
>> We had a presentation at our radio club several months ago on digital HF
>> modes, and part of the presentation was on JT65 and apparently it needs
>> a precise synchronized time fix on both ends for an exchange to occur.
>> I do not recollect all of the details that were presented, but they did
>> say that the default windows time keeper is not accurate enough, and
>> advocated installing a third party ntp client that updates (way too)
>> frequently.
>> 
>> -Brian
> 
> I think it might be JT65 he is using. I know he said that if your time
> was accurate to 1 ms, and someone elses 2 ms, you have a higher chance
> of making the QSO. Hence there is a need for accurate timing. (I'm not
> sure he said those exact figures of 1 and 2 ms, but the general point
> was that it needed to be accuate, and increased accuracy gave a higher
> chance of making the QSO).
> 
> But the whole idea of getting time from an internet time server every
> few seconds seemed odd to me. He is not using any local time server.
> 
> I'll try to find out what mode he is using, and what software to
> correct his time.
> 
> Dave
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.




More information about the time-nuts mailing list