Nick wrote:
> On Fri, 18 Jul 2014 23:16:57 +, jimp wrote:
>
>> Nick wrote:
>>
>>
>>
>>> This performance is marginal for WSJTX. I need 10ms offset or less
>>> after 15 minutes.
>>
>> What make you think that?
>>
>> I see a lot of WSJTX signals that are within +/- .5 seconds and
>> occasionally some over a second off and they still decode. Most seem to
>> be +/- .3 seconds.
>>
>> We are talking about this aren't we:
>>
>> http://physics.princeton.edu/pulsar/K1JT/wsjtx.html
>>
>
> Yes we are.
>
> My spec was based only on experience using JT65B on HF using the old XP
> box which easily syncs within 10ms, and on which decodes are rock solid.
>
> http://www.vhfdx.de/wsjt/wsjt_user_470.pdf says...
>
> "You will need a method of setting your computer clock to an accuracy of
> one second or better, and keeping it set. Many operators use an internet
> clock-setting program, while others use a GPS or WWVB receiver."
>
> Thank you for helping me realise the extent of my own ignorance!
>
>> Though I agree ntp should be doing a lot better than you are seeing.
>
> Yes. I'll keep digging.
FWIW, the largest offset I've seen WSJT-X decode is 3.5 seconds and lots
of DX stations are in the 1 to 2 second range.
BTW, if you are not using it, JT-utilities is very handy.
http://hamapps.com/
--
Jim Pennino
___
questions mailing list
questions@lists.ntp.org
http://lists.ntp.org/listinfo/questions
