SINPO is an acronym. Here's what it stands for:
- S - Signal Stregnth
- I - Interference
- N - Noise
- P - Propagation
- O - Overall Rating
I have also seen references the same code as "SINFO." In that case, the 'F' stands for Fading, instead of 'P' for Propagation. They are otherwise identical. There are also scant references to an SIO code. Both are referred to in Andrew Yoder's book Pirate Radio. This just compares signal to interference for an overall measure. Of course not all shortwave listeners area aware of SINPO and just use common adjectives. In it's original form there were quantifiable observations for each digit. This has diminished over time and the SINPO scores have become less formal. This may have led to the creation of SINPFEMO.
S - Signal Stregnth
I - Interference
N - Noise
P - Propagation
F - Fading of Frequency
E - Modulation Quality (Excellent)
M - Modulation Depth (Maximum)
O - Overall Rating
It is highly likely that both systems originate in a much older code created by BBC engineers called RAISO.In true British spirit this was actually shortened for utility. The full acronym was RAFISBEMVO. In true engineer spirit, many of the letters stood for nothing at all making it difficult to memorize or use. The book Early Shortwave Stations by Jerome Berg has a little more information on this.SINPO and SINPFEMO were formally recommended by the Comité consultatif international pour la radio in 1961. Why they've been supplanted by the ITU, their recommendations stand.
R - Carrier Strength
A - Fading (Depth)
F - Fading (Frequency)
I - Interference
S - Static
B - Background Noise
E - Transmitted Noise
M - Modulation (Degree)
V - Modulation (Duality)
O - Overall Rating
If any British readers can direct me to more research material on this I'd appreciate it.
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