Hello Alberto and all,
here the MF opds8 detection's list of last night, here in JN80, that includes your signal. Congratulation for the good start.
IZ7SLZ loc.JN80NU OPDS Correlation Detector (opds2h5c by DF6NM)
date time call distance frequency bandwidth snr correlation
2016-09-21 03:48:20 EA4GHB 1755km 478500.209Hz 548mHz -38.0dBOp 100% 19.1dB
2016-09-21 03:20:11 SV8CS 466km 478499.724Hz 131mHz -34.5dBOp 70% 19.1dB
2016-09-21 03:02:11 SV8CS 466km 478499.346Hz 649mHz -99.9dBOp 77% 19.2dB
2016-09-20 23:53:23 G6AVK 1736km 478490.000Hz 7mHz -42.6dBOp 91% 17.8dB
2016-09-20 23:48:20 EA4GHB 1755km 478500.039Hz 73mHz -39.8dBOp 93% 16.6dB
2016-09-20 21:56:29 PA3ABK 1543km 478500.080Hz 107mHz -39.6dBOp 100% 18.2dB
2016-09-20 21:04:33 PA3ABK 1543km 478500.027Hz 187mHz -37.2dBOp 66% 16.4dB
2016-09-20 20:55:00 G6AVK 1736km 478490.000Hz 7mHz -36.9dBOp 100% 19.3dB
Noted also a very steady signal from G6AVK: Colin seems to have an "EbNaut-ready" setup.
Once again, many thanks to Markus DF6NM for his opds work.