On Mon, 28 Jul 2014 17:00:55 -0400
Joe Taylor <[email protected]> wrote:

> As described in all of our manuals back to 2001, the "slow" modes in 
> WSJT all require good timing synchronization (+/- 1 or 2 s, say) between 
> transmitting and receiving computers.  The slow modes currently include 
> JT4, JT9, JT65, and WSPR.
> 
> Data frames are not sent "several times" in these modes.  Rather, 
> there's a single data frame, and it's sent once.  It contains a lot of 
> redundant information -- about 5x redundancy in JT65, and 2x redundancy 
> in the other three modes; but the redundancy is NOT the same thing as 
> simple repetition.
> 
Thanks for the clarification Joe




>       -- 73, Joe, K1JT
> 
> On 7/28/2014 1:07 PM, Richard wrote:
> > Hi All,
> > If I run continuous TX in beacon mode, does the start of each Tx block of 
> > date need to be
> > synchronised to a time server?
> >
> > In a one minute period a data block is sent several times, so wouldn't the 
> > receiving station
> > just decode what it receives  ? , I cant see any reason to time stamp a 
> > continuous transmission.
> >
> > Or am I being too simplistic ???
> > It will be running JT4G
> >
> > Thanks
> >
> 
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-- 
-- 
Best wishes /73
Richard Bown

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