command will compute the decibel level of a power quantity using the
default reference level; @kbd{H l d} [@code{dbfieldlevel}] will
compute the decibel level of a field quantity. The commands @kbd{l n}
command will compute the decibel level of a power quantity using the
default reference level; @kbd{H l d} [@code{dbfieldlevel}] will
compute the decibel level of a field quantity. The commands @kbd{l n}
[@code{npfieldlevel}] will similarly compute neper levels. With the
capital @kbd{O} prefix these commands will read a reference level
from the stack; in an algebraic formula the reference level can be
[@code{npfieldlevel}] will similarly compute neper levels. With the
capital @kbd{O} prefix these commands will read a reference level
from the stack; in an algebraic formula the reference level can be