[Lowfer] WD2XES Opera 32

[John Andrews]

Garry,

You make an excellent point. These digital modes tend to be evaluated by their proponents based on steady-state noise. The real (LF) world has static crashes, electrical impulse noise and fading. Tests with Jay at 600m between Opera and WSPR suggest that Opera's static crash tolerance is more limited. 

But, Opera has the significant advantage of simple transmitting requirements - on/off keying, no SSB exciter, and non-linear PA. 

John, W1TAG



On Aug 27, 2012, at 7:43 AM, Garry Hess <k3siw at sbcglobal.net> wrote:

> John, yes it was noisy here but the Opera SNRs seem too low when I 
> consider how well your signal looked on the Spectrum Laboratory 
> waterfall set to approximately QRSS3 bandwidth. It looked better than 
> WSPR signals with SNR above -20 dB. Didn't check out XGJ but I'd say the 
> level was comparable to what XGJ was the previous evening. Also missed 
> VX9BDQ because it was nearly sunrise when I could have changed to Opera 
> 8 and by then it was QRT.
> 
> Too bad, because propagation to the west was excellent. Copied NDB MOG 
> on 404 kHz LSB at -1052 Hz, 7.98 s cycle for the first time in quite a 
> while. A quick look at DGPS stations around 1040Z decoded 054 in NM on 
> 291 kHz, 138 in OR on 294 kHz, 172 in WA on 300 kHz, 174 in UT on 303 
> kHz, 084 in CA on 305 kHz, 074 in NV on 312 kHz, 062 in MT on 313 kHz, 
> 068 in WA on 316 kHz, 064 in AZ on 319 kHz, 305 in BC on 320 kHz, and 
> 264 in CA on 321 kHz.
> 
> This morning EAR is coming through well on QRSS30 at 188.83 kHz but see 
> nothing from MP on 137 kHz. Perhaps it's down, intended or otherwise.
> -- 
> 73, Garry, K3SIW, EN52ta, Elgin, IL
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