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.
-- 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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