S-Meter
Received signal strength plots

Newport, Oregon Receiver Signal Strength Indications

S-Meter calibration and signal strength plot interpretation

Kenwood R-5000 and Website S-Meter Plot Calibrations
There is no official industry standard, but most communication receiver manufacturers consider S9 to be 50 microvolts of radio-frequency voltage across the antenna terminals. Each S-Unit below 50 microvolts generally is considered to be 6dB (1/2 voltage, 1/4 power) lower. However, actual S-Meter calibration against those generally accepted standards tends to be very poor with most receivers.

S-Meter calibration of the Kenwood R-5000 at this website was measured with laboratory-quality test equipment. The results are shown in the table below. Even though the built-in analog S-Meter calibration is not very good, it is better than for most receivers. We correct the analog meter calibration errors in software after analog to digital data conversion, so that the calibration of the S-Meter plot at this website is correct to within a fraction of a dB for both HF and VHF.

Kenwood R-5000 Receiver Website
StandardS-Meter ReadingHFVHFS-Meter Plot
50.00mvS9+60Off-ScaleOff-Scale+60
15.81mvS9+50S9+60Off-Scale+50
5.00mvS9+40S9+55Off-Scale+40
1.581mvS9+30S9+45Off-Scale+30
500uvS9+20S9+35Off-Scale+20
158.1uvS9+10S9+22Off-Scale+10
50uvS9S9+10S9+15S9
25uvS8S9+5S9+8S8
12.5uvS7S8S9+2S7
6.3uvS6S6S7.5S6
3.2uvS5S4S5S5
1.6uvS4S1S3.5S4
0.8uvS3<S1S3S3
0.4uvS2<S1S1S2
0.2uvS1<S1<S1S1

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