my fault... initially I didn't have the NTP software running. When I started it in the middle of the QSO it corrected a 1.5 second clock error. This unintended experiment confirms that JT9 v0.4 is indeed much more robust than prior versions.

 

Many thanks for this great piece of work!

 

Best 73,

Markus (DF6NM)

Hi Markus, Stefan, and all, 

 

It appears that you have things working reasonably well in JT9-1.  Here  

are the decodes Markus received from Stefan: 

 

  UTC Sync  dB    DT   Freq   Drift  Message 

---------------------------------------------------- 

1916  10    4   1.4   1940.   0.0   DF6NM DK7FC -03 

1918  10   -2   1.5   1940.   0.0   DF6NM DK7FC -03 

1920  10   -3   1.4   1940.   0.0   HURRAAAAAAAAA 

1922  10   -4   1.4   1940.   0.0   HR 30W TX PWR 

1924  10   -2   1.5   1940.   0.0   MENSCH MARKUS 

1926  10    0   1.5   1940.   0.0   PSE AGN RPRT 

1928  10    1   1.5   1940.   0.0   PSE AGN RPRT 

1930   5    4   1.5   1940.   0.0   UR -3...+5DB 

1932  10   -9   1.6   1940.   0.0   NW 5W TX PWR 

1934   1   -6   1.5   1940.   0.0   HALLO MAX 4TS 

1936  10   11   1.6   1940.   0.0   NUR80  CPI 

1938  10    3  -1.3   1945.   0.0 

1940  10    4  -0.1   1940.   0.0   SPITZEN SACHE 

1942  10    9  -0.0   1940.   0.0   YOU HAVE A CA 

1944  10   -3   0.0   1940.   0.0   UR -7...+5DB 

1946  10   16   0.0   1940.   0.0   1943 AGN PSE 

1948  10   18  -0.0   1940.   0.0   1943 AGN PSE 

1950  10   12   0.0   1940.   0.0   OK73NM FC SK 

1952  10    6   0.1   1940.   0.0   CIAO MARKUS55 

1954   2  -37   0.0   1918.   0.0 

 

What happened between the transmissions at 1936 and 1940?  The measured  

clock offset DT changed from about +1.5 s to nearly zero.  (Note that  

+1.5 s is an unusually large offset, possibly indicating a problem.  In  

general, with good NTP synchronization at both ends, DT should be nearly  

constant and in the range +/- 1 s.) 

 

--- Joe, K1JT