THE "SINPO" SYSTEM


The SINPO system is the internationally accepted method of making reception 
reports when writing in for QSL cards.  SINPO is, of course, an acronym.

S = Signal strength
I = Interference level
N = Noise level
P = Propagation [how often the received signal oscillates]
O = Overall sound quality

For each of the above categories, report signal quality rated from 1 to 5 as 
follows.

5 = excellent
4 = very good
3 = acceptable
2 = poor
1 = terrible

The category 'O', or overall sound quality is a summary of the other four, 
but the rating for it may not exceed the lowest of the 'I' and 'N' category 
ratings.  For example, if S=5, I=3, N=2, P=5, then O may not be greater than 
2.