Finally I did it! Using the idea of EA1GHE and my Kenwood TS850s I can listen now DRM Digital Radio Mondiale stations. If you got a Kenwood TS850 you must build the down-converter and connect it to a PC with a good sound-card (I use the old SB Live but it seams that is working also on my  HP 530 Laptop) and on the other side, connect the converter board also to the DSP2 plug.

Powering up the transceiver keep the F.Lock button pressed to enter a setup menu. Tune with the M-CH./VFO.CH knob at menu 5, turn it on by pressing the Up/Down keys and after that turn off the rig and back on. You will not have sound on you’re speaker in USB/LSB CW/FSK mode but you can hear the reception on AM/FM mode. To come back at normal settings, proceed the-same  steps but turn the menu 5 OFF.

To receive DRM you must set the transceiver to FSK mode, 12Khz filter on 455Khz FI and no filter on 8.83FI, AGC knob must be set to Slow, AIP and Noise Blanker must not be activated.

A good DRM frequency for testing is 13.810 Khz DW/BBC broadcast station. If you can’t hear anything there, check the DRM Frequencies list.

Have fun by listening hi quality digital radio on shortwave!

RO: Folosind ideea lui EA1GHE impreuna cu Kenwood TS850s-ul meu, am reusit sa “decodez” semnale DRM Digital Radio Mondiale. Pentru detinatorii de TS850s care doresc sa expermenteze DRM tot ce trebuie facut este convertorul de la FI-ul de 36.891 khz obtinut pe mufa DSP2 la cei 12Khz pentru DRM.

Odata montajul realizat mi-a luat ceva timp sa-i dau de cap cum se activeaza portul DSP2 al transceiverului. Procedura este relativ simpla, porniti transceiverul din  butonul Power tinand apasat in acelasi timp butonul F. Lock. Rotiti M-CH./VFO.CH la meniul 5 si schimbati pe ON folosind tastele Up/Down dupa care opriti si porniti transceiverul in mod normal. Atentie! Odata meniul 5 activat, in modurile de lucru USB/LSB – CW/FSK nu veti mai auzi sunet in difuzorul statiei! Dupa ce v-ati delectat cu DRM-ul, pentru a reveni la modul initial repetati pasii de mai sus trecand pe OFF functia de la meniul 5.

Pentru a receptiona corect, folositi modul FSK aflat pe transceiver, filtrul de 12Khz pe 455Khz iar pe 8.83 dezactivati orice filtru, AGC-ul trebuie pus pe Slow, Noise-Blanker-ul si AIP-ul nu trebuiesc activate.

Personal am testat emisia DW/BBC de pe 13.810 Khz, totusi o lista a posturilor ce emit DRM poate fi gasita aici.