[A-DX] Shortwave Radiogram, 27-28 January 2018

[Roger]

Am 26.01.2018 um 19:31 schrieb Shortwave Radiogram:
> Hello friends,
>
> While waiting for the Monday 0800 UTC broadcast of Shortwave 
> Radiogram, I was surprised to hear a digital mode on 7730 kHz from 
> WRMI Florida. I recognized it as MFSK16, at about 800 Hz. It was the 
> Broad Spectrum Radio program on WRMI, scheduled for Monday at 
> 0700-0800 UTC. It might be worth a listen this Monday to see if the 
> MFSK16 (or any other mode) is repeated.


I have checked the two latest editions of the BSR program, which are 
available on the Internet.
With a spectral scan, I found the corresponding signals quite quickly 
(visually) at the end of the November issue.
The CW signals were very easy to decode - with FLDIGI.
The MFSK signals, however, were of poor quality, without RSID, on 
crooked audio frequencies.
An MFSK16-txt track was found at 526 Hz, with +/-2 Hz tolerance and a 
subsequent MFSK16-pic track at 553 Hz, with incredible +/-1 Hz 
tolerance, to get at least fragments of the image txt-header.
In order to get a valid 100x100c image trigger, I had to generate my own 
audio and put it in the right place.
This "digital BSR challenge" was quite a tricky thing.


http://www.rhci-online.net/radiogram/SW_Radiogram_2018-01-20.htm#BSR


roger