Re: LF: JT9-1 and 2, echoes, waterfall

[g3zjo <g3zjo@psk31.plus.com>]

Hi Stefan

I found the lack / loss of decodes annoying, one cause was slight frequency drift in my transverter, WSPR is not effected but JT9-2 is.
I feel there were other periods of unexplained non de-codes too.

Was it you who mentioned the burst at the end of the signal. I was hearing a tuneful diddle at the end of G3XIZ transmission, I hear a burst of distorted rattle on my own signal.

Eddie

On 29/10/2012 23:47, Stefan Schäfer wrote:

Hello Markus,

OK so far. Thanks for your observations.
Why are the levels so low? This is another open question. And why are decodes missed? Have you watched the decoder, was it finished before the next set of data is ready to be decoded? The decode time can be significantly reduced when reducing the decoder BW. On my TX-only instance i reduced it to +-1 Hz which is very helpful.

I do not think that my transmissions are defective (glitches) so it is an open question why some decodes are missed.

73, Stefan



Am 30.10.2012 00:30, schrieb Markus Vester:

The ghost echo appeared again today on every JT9-1 transmission from Stefan. The effect appears in the waterfall and seems to create sync points, so may possibly affect decoding. But there is no trace of the echo in the wav files! I've uploaded a pair of examples (original at 22:38, echo at 22:39) to

http://df6nm.bplaced.net/wsjt/jt9-1_121029/

 

Some decodes from Stefan's JT9-1 and JT-2 so far, but still many failed slots (see below). Stefan I wasn't aware you were actually keeping pets... our red cat Gizmo is sitting here in the shack, watching all this activity with deep interest ;-)

 

Yes on my little Atom netbook the new r2702 does take its time to do the decodes, and at one time I also found the process living on for a while after closing the window.

 

Change request to Joe's team: Would be nice if we could center the waterfall to the working audio frequency, rather than a fixed 1000 Hz start frequency. I would also like to pull the window narrower so that both fit into a 1024x600 screen side by side. 

 

Thanks again to Joe (DF2JP) and Chris (4X1RF) for the reports on my short test!

 

Best 73,

Markus (DF6NM)

 

 

2219   5  -25   0.2 1929.83  0.00
2220  10  -13  -0.2 1931.04  0.00
2221  10  -21  -0.2 1931.04  0.00
2222  10   -9   0.1 1931.04  0.00
2223  10  -19  -0.1 1931.04  0.00
2224   4  -25   0.0 1931.04  0.00
2225   2  -27  -0.2 1929.31  0.00
2232  10  -20  -0.1 1932.51  0.00
2233   5  -24   0.2 1930.77  0.00
2234   4  -25   0.2 1929.58  0.00    TX TEST DK7F        
2235   4  -25  -0.2 1929.83  0.00
2236   3  -26   0.2 1929.58  0.00    TX TEST DK7F        
2237   4  -25  -0.2 1929.83  0.00
2238   5  -25   0.2 1929.58  0.00    TX TEST DK7F        
2239   4  -26  -0.2 1929.83  0.00
2240   1  -28   0.2 1929.58  0.00    TX TEST DK7F        
2241   4  -25  -0.0 1931.04  0.00
2242   0  -32  -0.1 1930.77  0.00
2243   0  -30   0.0 1930.39  0.00
2244   0  -32   0.0 1932.03  0.00
2246   0  -30  -0.4 1926.90  0.00
2248   2  -26  -0.1 1931.56  0.00
2248  10  -11   0.3 1940.04  0.00
2250   1  -28  -0.2 1943.67  0.00
2252  10  -11   0.4 1939.93  0.00   I HAVE A CAT         
2254   0  -29   0.1 1934.80  0.00
2256  10   -9   0.3 1939.93  0.00
2258   0  -32  -0.1 1935.64  0.00
2300  10  -12   0.3 1939.93  0.00   I HAVE 2 CATS        
2302   0  -29  -0.1 1932.95  0.00
2304  10  -12   0.3 1939.93  0.00   I HAVE 2 CATS        
2306   0  -29   0.4 1933.03  0.00
2308  10  -13   0.4 1939.93  0.00   I HAVE 2 CATS        
2310  10   -9   0.4 1941.89  0.00
2312  10  -14  -0.4 1941.55  0.00   000AAA 000AAA RA90   
2314  10  -15   0.3 1940.93  0.00

 

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