S DBW to S Meter Correlation Table
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The following table shows how S DBW (median signal power expected at the receiver input terminals) values can be mapped to S meter readings.
There are a few assumptions: the receiver input impedance is 50 Ohms and the transmission lineloss is minimal. Also we assume that the S meter is correctly calibrated. In practice, S meters are mostly imprecise and can only give relative readings.
S DBW W (50 Ohm) dBuV microvolts S Meter -43.01 5.00E-05 93.98 50000.000 S9+60 dB -53.01 5.00E-06 83.98 15811.388 S9+50 dB -63.01 5.00E-07 73.98 5000.000 S9+40 dB -73.01 5.00E-08 63.98 1581.139 S9+30 dB -83.01 5.00E-09 53.98 500.000 S9+20 dB -93.01 5.00E-10 43.98 158.114 S9+10 dB -103.01 5.00E-11 33.98 50.000 S9 -109.03 1.25E-11 27.96 25.000 S8 -115.05 3.13E-12 21.94 12.500 S7 -121.07 7.81E-13 15.92 6.250 S6 -127.09 1.95E-13 9.90 3.125 S5 -133.11 4.88E-14 3.88 1.563 S4 -139.13 1.22E-14 -2.14 0.781 S3 -145.15 3.05E-15 -8.16 0.391 S2 -151.18 7.63E-16 -14.19 0.195 S1
Thank-you
This table has been refined as per suggestions by Ahti OH2RZ.