[A-DX] {WOR} Shortwave Radiogram, 10-11 Feb

Sa Feb 10 23:26:09 CET 2018

Am 10.02.2018 um 00:56 schrieb kd9xb:
> Most of the show is in MFSK32, with four images.  There will also be 
> an experiment comparing the Olivia 8-2000, 8-1000, and 8-500 modes: 
> does it help to concentrate the data in narrower slices of bandwidth 
> within the 2000+ Hz available in a shortwave broadcast sideband?
> Details and schedule:
> http://swradiogram.net/post/170688809937/shortwave-radiogram-10-11-february-2018

The reception here was too good to notice a difference.
In any case, the experience of the last few years says: Concentrated 
data are more advantageous with very weak RF signals, against pure noise.
A wide and interleaved mode is more favorable in the case of audio QRM, 
strong and deep fading and multipath.
Here is the AF spectrum of SWRG number 34:


The guy in the picture (for the next WORLD RADIO DAY)  looks like he's 
having trouble with a jammer on the same frequency. ;-)

Some trouble was in the second radiogram of BSR.
The MFSK16 signals were on a crooked audio frequency, with no previous 
RSID. In addition, the signal wobbled by more than 10 Hz, here was the 
MFSK AFC required.
Then there was a systematic text error: each 2 missing symbols 
(combination of letters, spaces or line breaks) after various special 
Then 40s of audio data were missing in a MFSK image, filled up at the 
end with the following text-audio.
And then at the end still pure html source code. It definitely works 
more elegantly, as we know it from the SWRG .....
Here is the digital spectrum #2 of Broad Spectrum Radio, January 2018