[time-nuts] Need Time Help
mark at alignedsolutions.com
Wed Oct 5 10:35:21 EDT 2016
Yes I'd be curious in knowing more about this as well. I've often observed time differences from other stations of several tenths of a second when running the JT modes on HF. Although I am beginner at EME I have made a couple of EME (earth moon earth) JT65 contacts on VHF without taking any special measures to sync the time on a Windows XP machine beyond using the built in features of the operating system to sync to my own local time server which was in turned synced to the 1 pps output of a GPS timing receiver.
I've also made FSK441 contacts (another related form of amateur radio digital communications) in the field without any time reference besides the free running clock in my Windows xp laptop. If there is a significant performance improvement to be had with these modes by having time nuts levels of timing precision on my computers I'd be very interested to know more.
All the best
Sent from my iPhone
> On Oct 5, 2016, at 6:18 AM, Peter Torry via time-nuts <time-nuts at febo.com> wrote:
> I must admit to being rather puzzled at the sub microsecond timing requirement as I use ntp to set the W7 clock in my computer and have not had any issues. In fact less than one second is OK for the usual two minute periods that are required to allow for the Faraday rotation. Although I use a GPSDO for a frequency reference I find JT software reasonably tolerant of frequency. As I may be missing something I would welcome observations on how important the period timing requirement is, you never know I might get more contacts.
>> On 05/10/2016 12:50, Graham / KE9H wrote:
>> For the group. This ham is trying to work EME. Earth-Moon-Earth propagation
>> path. Aka, "moonbounce."
>> He is trying to time synchronize a system, where the other station he is
>> with can be any other place on the Earth that can also see the Moon.
>> So the system time sync is for a little bit tougher case than a local area
>> --- Graham
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