hello felix,
>>please remember to always reply to the list.
i'm sorry, i'm new at this. i have checked my
configuration and i hope it works the next time.
to mix up the baseband signal to 12khz or higher to short
wave (3-30mhz) should be the same procedure. i have tested
it by using a multiply block and a signal source block as
the carrier frequency.
but there is an other question: if i configured my system
as described, can i be sure that the bandwidth of each sub
carrier has the bandwidth and symbol duration as shown by
the equations?
used_bw = occupied_carriers * df
df = used_bw / occupied_carriers = 10khz / 228
df = 43.86hz --> tsym = 22.8ms
it's very confusing why i have to adjust my used bw by
changing the sampling rate. when i follow the equations and
the standard i choose one mode (RM A, SO 3). that means i
have to use 228 carriers
and have a symbol duration with 24ms which leads to 41.66hz
carrier spacing. so the used bw is 228 * 41.66hz = 9.5khz
(approx. 10khz). this bw should be fix and should not change
by the sampling rate.
sorry for the maybe silly questions but i want to keep on
that stuff.