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Re: Testing JT9-1 on LF:

To: [email protected]ep.org
Subject: Re: Testing JT9-1 on LF:
From: Stefan Schäfer <[email protected]>
Date: Fri, 16 Nov 2012 21:49:01 +0100
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]>
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Hello Joe,

Am 16.11.2012 21:36, schrieb Joe Taylor:
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?
No changes were done from my side on the RX PC (I use one PC for
generating JT9-1 and another PC for receiving on LF/MF). The time server
program is synchronizing once a minute! So maybe it happens on the TX
PC. But Markus decoded every message! Odd...
You know, no problems in WSPR, which uses SpecLab+VAC in the audio chain
as well...
73, Stefan/DK7FC



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

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