== IARU Region 1 teknisk anbefaling R.1==
[[International Amateur Radio Union]] (IARU) Region 1 er blevet enig om en teknisk anbefaling til S-meter kalibrering til [[Højfrekvens (3 MHz - 30 MHz)|HF]] og [[VHF]]/[[UHF]] transceivere i 1981.<ref name="iaru_standard">[https://www.iaru-r1.org/wp-content/uploads/2021/03/VHF_Handbook_V9.01.pdf www.iaru-r1.org: IARU-R1 VHF Handbook. Version 9.01 March 2021] Citat: "...[page 115] IARU Region 1 Technical Recommendation S-METER READINGS. BRIGHTON 1981, TORREMOLINOS 1990. 
Standardisation of S-meter readings 
* One S-unit corresponds to a signal level difference of 6 dB, 
* On the bands below 30 MHz a meter deviation of S-9 corresponds to an available power of -73 dBm from a continuous wave signal generator connected to the receiver input terminals, 
* On the bands above 30 MHz this available power shall be -93 dBm,  
* The metering system shall be based on quasi-peak detection with an attack time of 10 msec +- 2 msec and a decay time constant of at least 500 msec. ...", [https://web.archive.org/web/20210325191715/https://www.iaru-r1.org/wp-content/uploads/2021/03/VHF_Handbook_V9.01.pdf backup]</ref><ref name="iaru_standard2">International Amateur Radio Union Region I (1981).  [https://web.archive.org/web/20051128171109/http://www.algonet.se/~k-jarl/ssa/IARU/smeter.html IARU Region 1 Technical Recommendation R.1]. Brighton, England, UK.</ref>
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