Unknown Digital Mode

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  • Question
  • Updated 2 years ago
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Can anyone ID the digital mode in the passband on the video?
Thank you
Ken
W0KRD
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Ken Davis

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Posted 2 years ago

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Larry Davis

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Official Response
jt65
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Ken Davis

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Thanks Larry - Thats about the only mode DM780 does not have.
73 :-)
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Ria - N2RJ, Elmer

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And will never have. Yes, there's a backstory here.
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Dudley - WA5QPZ

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JT-65,   you normally would use WSJT-X to decode that ..  And your station computer clock has to be within 1 second,  alternated one minute receive,  one minute transmit. Evens or odds.. 

A good link    http://hflink.com/jt65/


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Bob Craig, K8RC

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That's actually multiple stations transmitting simultaneously. One of the requirements of JT-modes is time accuracy. So several stations come up together over the span of the bandpass.
(Edited)
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Ken Davis

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If my system sets time automatically to the internet time, would that get me within the 1 second window?
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Bob Craig, K8RC

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Yes, as long as you are using a program that sets time periodically instead of once-in-a-blue-moon like the built-in Windows mechanism.

I just checked and this laptop, last synchronized approximately 9 hours ago, was over 2.7 seconds off.

I use NixieClock from ClockVault.com:

http://www.clockvault.com/clocks/nixiehowto.htm

...mainly because I wrote it many years ago.

73,
Bob, K8RC
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Walt

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Yep !

Tune to WWV and listen to confirm it . .

Cheers!
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Ria - N2RJ, Elmer

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No. You should use a utility such as meinberg which continuously pulls the clock back to the correct time.
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Walt

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oh well - guess I have a really good motherboard clock . .   my time has always been within the second.

Cheers again !
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Paul

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The windows sync is perfectly adequate as long as you decrease the update interval. No need for specialist applications. This was discussed at length here:
https://community.flexradio.com/flexr...
I have mine sync every hour and never have a problem with any of the JT modes.
Hope this helps.
Instructions on how to do this at:
https://www.pretentiousname.com/times...
(Edited)
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Bob Craig, K8RC

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Actually, it depends more on how many interrupts your CPU is servicing.
Updating the clock is still a low priority. 

Almost anything works better than Windows (especially Win10) in this area.

BTW, I'm not selling anything.
It's freeware.
(Edited)
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Ria - N2RJ, Elmer

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I prefer a true NTP client which doesn't cause big steps in the clock. Instead it speeds up and slows down the clock as needed. It's like driving. The SNTP clients are like veering off course and jerking your steering wheel back to the middle of the road whereas a real ntp client continuously monitors the road and continuously keeps you in a straight line.
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Paul

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I have a 1957 series 1 Land Rover where the steering is accomplished by timely jerks on the steering wheel. I still manage to keep it going in a straight line when necessary. I believe this is a similar scenario :)
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Michael Coslo

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I use NetTime, and it works really well. 
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Ken Davis

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Thanks everyone for the help
Ken
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Mark WS7M

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I think you also have what I have in places.  It looks like you have a power supply that is noisy and causing that swirly back and forth S curve you see right before the JT signals start.

I have these in many places and they drive me nutz.   I'm trying to find and kill them.  Check out this nasty video of 20m before I killed the primary offender:

https://dl.dropboxusercontent.com/u/7578983/20mNoise10192015.mp4