SINPO stands for the following quantities measured in a scale of 1 to 5 wherein the lowest indicates the least and highest number indicates most. S - Signal strength I- Interference with other stations or broadcasters N - Noise ratio in the received signal P - Propogation (ups and downs of the reception) O - Overall merit After some experience, anybody can compute these values by experience. Keep in mind that the broadcaster will be getting similar reports from other listeners from your area on the same programme you did listen.
After listening to a broadcast (usually from 30 minutes to 2 hours), the listener has to create a report with SINPO values, indicating her/his location (called QTH in amateur radio teminology) in Longitude and Latitude (or else, if you are in a popular town, can indicate that without worrying about the geographical location). A brief description of the programme listened to, listener's opinion about it, suggestions if any so on.
The listener can send the report to the broadcaster either by post or by E-mail indicating she/he expects a QSL from them.
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