On 25 mar, 16:46, wrote:
Szczepan Bialek wrote:
I am simple asking if radio people have trouble with the fact that the speed
of waves are frequeny dependent.

No, they are not because the speed of electromagnetic waves is NOT frequeny
dependent, the speed is media dependent, you babbling, ignorant, trolling,
moron.

--
Jim Pennino

Remove .spam.sux to reply.

Hello Jim,

Given a certain medium, both phase and group velocity can be frequency
dependent (example: ionosphere).

DRM uses OFDM to achieve very low baudrate to mitigate the dispersive
behavior of ionospheric propopation. A least 88 subcarriers are in 10
kHz bandwidth.

Wim
PA3DJS
www.tetech.nl