Microvolts to dbm6/13/2023 ![]() IARU Region 1 Technical Recommendation R.1 defines S9 for the HF bands to be a receiver input power of -73 dBm. The International Amateur Radio Union (IARU) agreed on a technical recommendation for S Meter calibration for HF and VHF/UHF transceivers in 1981. Having said all that, what kind of voltages exist at the antenna socket? S Meter Specification Quite literally, as soil conductivity around an antenna is a vital part of its characteristics. Radio hams exchanging signal reports should realise that to be of any value, the two operating stations must be identical from the ground up. ![]() Even then the antenna has to be an EXACT match to the input impedance of the set with no compromises. Only in a few classic designs has the law on which the S Meter scale is based been fully interpreted. Have fun with them by all means but please do not hold them up as gospel. True to say the figures over nine lend importance to a report and the graphic use of red in some designs make the listener feel something really special is going on, but they are for the most part only a guide. They must be the most talked about topic on the air.
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