Re: Testing JT9-1 on LF:

[Markus Vester <markusvester@aol.com>]

Hi Joe,

 

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)

-----Ursprüngliche Mitteilung----- 
Von: Joe Taylor <joe@Princeton.EDU>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Fr, 16 Nov 2012 8:37 pm
Betreff: Re: Testing JT9-1 on LF:

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