[A-DX] {dxld} VOA Radiogram, 11-12 Mar 2017

[Roger]

Am 11.03.2017 um 00:20 schrieb  [dxld]:
> Includes a comparison of two 58-wpm modes, MFSK16 and Olivia 8-1000  ...
>
> http://voaradiogram.net/post/158241085387/voa-radiogram-11-12-march-2017-battle-of-the
>




Stress test:   MFSK16 versus OL-8-1K in a Wave Editor

1.)  as a mix, in one file, simultaneously, both modes @1500 Hz AF 
overlapping:  2 x  100% decoding.


2.) Finally, with additional strong (overdriven) white noise, the winner 
becomes clear:

MFSK16 continues to be 100% decoding, the pattern is still visible in 
the waterfall. OL-8-1K now with some errors in the text, at last.


MFSK-16 +  Olivia-8-1000     @ 1500 Hz
Modes must be set manually, overlapping RSIDs not working:

https://www.dropbox.com/s/dmtspk178vfagrx/2017-03-11_VOA206-MFSK16-OL8-1K-White_Noise.wav?dl=1

https://www.dropbox.com/s/kcns9cazmt86mid/2017-03-11_VOA206-MFSK16-OL8-1K-White_Noise.png?dl=1

(The MFSK-16 + OLIVIA-8-1000 audio comes from the System-D stream of WRMI)




But, at another competition in the wave-editor:

MFSK-16 against MFSK-16, same data, but a delay of 100ms:          50% 
decoding

OL-8-1000 vs OL-8-1000, same data, again a delay of 100ms:        100% 
decoding !!!

OLIVIA is thus the winner in the case of strong multipath.

MFSK16 is better at weak one-way paths.


roger



roger