[Lowfer] WSPR/JT9-2 Shootout

Eric Tichansky no3m at no3m.net
Fri Dec 21 17:19:51 EST 2012


So far WSJT-X (JT9-2) consistently reporting 1-2 dB lower SNR than 
WSPR.  I am noticing that JT9 is decoding *much* faster than WSPR, by 
several seconds.  That is beneficial when using JT9 for QSOs.

WSPR:

2204 -18 -0.5   0.137451  0 WD2XES FN42 37
2208 -14 -0.4   0.137451  0 WD2XES FN42 37
2212 -13 -0.3   0.137451  0 WD2XES FN42 37
2216 -17 -0.4   0.137451  0 WD2XES FN42 37

JT9-2:

2204 10 -20 0.1 1400.8 0 WD2XES FN42

2208 10 -15 0.1 1400.7 0 WD2XES FN42

2212 10 -14 0.1 1400.8 0 WD2XES FN42

2216 10 -19 0.2 1400.8 0 WD2XES FN42

73 - Eric NO3M, WG2XJM

On 12/21/2012 15:55, John Andrews wrote:
> WD2XES will be running WSPR and JT9-2 at the same time on 136 kHz USB 
> tonight, starting around 2200 UTC. The WSPR signal will be at a 1450 
> Hz offset, and the JT9-2 signal at 1400 Hz. Power level of each signal 
> will be 6dB below normal, to allow for the capabilities of the linear 
> amplifier. Comparisons are invited.
>
> John, W1TAG/WD2XES
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