"SFTV_troy" wrote in message
oups.com...
On Oct 13, 2:50 pm, Telamon
wrote:

Ok, here is a difference you should understand. DRM uses two separate
transmitters and antennas one digital and one analog. HD uses two
different exciters one digital and the other analog that input into the
same transmitter and antenna at the same time.



Why does DRM have to use two separate antennas? Why can't DRM use a
combiner and output both signals through a single antenna?

Because the carrier frequencies are different... and because there is no
analog component to DRM... to do analog requires a separate station,
license, frequency.