modulation deviation造句

Channel spacing narrowed to 20 30 kHz with modulation deviation dropping to plus-or-minus five kilohertz.
Early tube-type radios operated on 50 kHz channel spacing with plus-or-minus fifteen kilohertz modulation deviation.
As use of mobile radio equipment has virtually exploded, channel spacing has had to be narrowed again to 12.5 15 kHz with modulation deviation dropping to plus-or-minus 2.5 kilohertz.
It's difficult to find modulation deviation in a sentence. 用modulation deviation造句挺难的