Poul_
Newbie level 1
Hi,
I have been reading ITU standards ITU-R S.524-9 and ITU-R S.1594 as part of some research for satellite communication antennas.
However I noticed when they specify the maximum off-axis EIRP density mask, they use the units dB(W/40kHz), dB(W/4kHz) or dB(W/2MHz). What is the reason for these different bandwidths? Why could one not just specify it as dB(W/Hz)?
Is there a particular bandwidth one should use depending on the application, frequency band, modulation scheme, LO stability, ...? Or is it something to do with the way one measures the off-axis EIRP density for an antenna?
I have been reading ITU standards ITU-R S.524-9 and ITU-R S.1594 as part of some research for satellite communication antennas.
However I noticed when they specify the maximum off-axis EIRP density mask, they use the units dB(W/40kHz), dB(W/4kHz) or dB(W/2MHz). What is the reason for these different bandwidths? Why could one not just specify it as dB(W/Hz)?
Is there a particular bandwidth one should use depending on the application, frequency band, modulation scheme, LO stability, ...? Or is it something to do with the way one measures the off-axis EIRP density for an antenna?