SINPFEMO, an acronym for Signal, Interference, Noise, Propagation, frequency of Fading, dEpth, Modulation, and Overall is used to describe the quality of radiotelephony transmissions.
[1] SINPO code is most frequently used in reception reports written by shortwave listeners.
Not all shortwave listeners are conversant with the SINPO code and prefer using plain language instead.
An extension of SINPO code, for use in radiotelephony (voice over radio) communications, SINPFEMO is an acronym for Signal, Interference, Noise, Propagation, frequency of Fading, dEpth, Modulation, and Overall.
The SINPO code in normal use consists of the 5 rating numbers listed without the letters, as in the examples below: Generally, a SINPO with a code number starting with a 2 or lower would not be worth reporting, unless there is no noise, interference or loss of propagation, since it would be likely the signal would be unintelligible.
[4] SINPO is said to have evolved from the BBC's RAISO format (full version: RAFISBEMVO, which measured:[5]