SINPO: Que significa, y como catalogan los niveles

Code explained

S (Signal strength) 

The relative strength of the transmission.

I (Interference) 

Interference from other stations on the same or adjacent frequencies (man-made noise).

N (Noise) 

The amount of atmospheric noise.

P (Propagation) 

Whether the signal is steady or fades from time to time.

O (Overall merit) 

An overall score for the listening experience under these conditions.

Each category is rated from 1 to 5 with 1 being 'unusable' or 'severe' and 5 being 'perfect' or 'nil'. MANY raters misunderstand the code and will rate everything either 55555 or 11111 when in reality both extremes are unusual in the extreme. '55555' essentially means 'perfect reception akin to a local station' while that is occasionally possible, when talking about long-distance short-wave reception, it is almost never the case.

Another common mistake in rating is presenting an 'O' higher than any previously rated element. By definition, a station cannot present 'perfect' reception if there is any Noise or Interference or Fading present. In other words, it is NOT 'perfect local quality' reception if any of those things are present.

S	I	N	P	O
Signal	Interference	Noise	Propagation conditions	Overall merit
5-Excellent	5-None	5-None	5-Excellent	5-Excellent
4-Good	4-Slight	4-Slight	4-Slight disturbance	4-Good
3-Fair	3-Moderate	3-Moderate	3-Moderately disturbed	3-Fair
2-Poor	2-Severe	2-Severe	2-Severe disturbance	2-Poor
1-Barely Audible	1-Extremely strong	1-Extremely strong	1-Very poor propagation	1-Useless