CVC Chile - Short wave
DRM - Digital Transmissions
CVC Chile has been doing experimental transmissions since 2006. Our signal is heard with excellent quality in Brazil (our target)
and also comes very well to several European countries (Germany, Switzerland, Sweden, Greece, etc.), from where we have received reception reports.
DRM is a system developed by the consortium with the same name whose mission is to establish a digital system for all the AM broadcasting bands world-wide (long wave, medium wave, short wave). There are digital radio systems such as Eureka 147 and IBOC. IBOC (in-band on-channel) use existing frequencies and transmits both digital and analogue radio. Eureka is a system that uses frequencies in the L band (1452 to 1492 MHz). DRM works in the bands under 30 MHz. In March 2005, was the system extended to 120 MHz; this new technology is called DRM Plus. The DRM signal can have 4.5, 5, 9, 10, 18, 20 kHz of bandwidth. The amount of sub-carriers varies from 88 to 458. DRM uses COFDM modulation (Coded Orthogonal Frequency Division Multiplexing), with the particularity that these frequencies are evenly spaced so that they are orthogonal. The DRM channels use Quadrature Amplitude Modulation (QAM).
For more information about DRM, visit www.drm.org or send us an email. You can hear a sample of our analogue transmission and then compare it with our digital transmission.
There is a forum with DRM reception reports. You can visit it for more information: www.drmrx.org/forum