 |
|
|
||
 |
||||
|
||||
|
|
|
 |
||
RTL RadioRTL are broadcasting DRM on 1440 kHz (208 metres) medium wave with ‘RTL Radio - Die besten Hits mit Gefühl’ from the Marnach transmitter site. RTL reception is shown below, for January the 1st and 2nd 2005; Mode B was used starting at a bitrate of 18.4 kbps (protection level 1). During the broadcast the protection mode was switched to level 0 (more robust) which improved the reception but reduced the audio quality. RTL switched back to AM at 17:00.
Mode A RTL broadcast for the 3rd January. Mode B RTL broadcast for the 4th January, perfect reception. Mode A RTL reception during the day (240 kW). During the day Mode A is preferred but at night the sky wave signal can be received were the channel’s Impulse Response exceeds Mode A’s guard interval (2.6 mSec) so Mode B is used. [Screen shots using DRMcalc analysis software written by Carsten Knutter, blue graph is audio frames decoded and the red line is signal strength expressed as a SNR]
|
||
