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Old 08-06-2018, 20:13   #35
AF4MP
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Join Date: Apr 2006
Location: Roswell, Georgia, USA
Posts: 10,097
WINB Bandwidth (Continued)

According to the DRM Consortiums "Tech Books":

The current channel widths for radio broadcasting below 30 MHz are 9 kHz and 10 kHz. The DRM system is designed to be used:

within these nominal bandwidths, in order to satisfy the current planning situation;
within half these bandwidths (4,5 kHz or 5 kHz) in order to allow for simulcast with analogue AM signals;

In other words you can't have 5 kHz DRM transmission by itself without the special situation of the simulcast accompanying AM analog signal. Therefore someone probably pushed the wrong button on the DRM content server, and half the signal that has been transmitted is correct and the other half is noise (see attachment) causing all kinds of problems!
Attached Images
File Type: png 5Khz BW.png (11.2 KB, 139 views)
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