When you're talking about trying to copy this 0.5 uv S1 signal in the
presence of 40-over-9 signals 5 and 10 kHz away (again, a common
real-world scenario on 6m during a contest), you're looking at a range
of 40 dB + ( 8 S-units x 5 dB/S-unit ) = 80 dB.
Minor niggle: 1 S-Unit = 6dB
http://www.algonet.se/~k-jarl/ssa/IARU/smeter.html
------------------------------------------------------------------------
STANDARDISATION OF S-METER READINGS
1. One S-unit corresponds to a signal level difference of 6 dB,
2. 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,
3. On the bands above 144 MHz this available power shall be -93 dBm,
4. 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.
------------------------------------------------------------------------
One does wonder about the bands between 10m and 2m.....
http://www.giangrandi.ch/electronics/radio/smeter/smeter.html
(Zc = 50 Ohm)
S1 -48 dB 0.20 uV -14 dBuV 790 aW -121 dBm
S2 -42 dB 0.40 uV -8 dBuV 3.2 fW -115 dBm
S3 -36 dB 0.79 uV -2 dBuV 13 fW -109 dBm
S4 -30 dB 1.6 uV 4 dBuV 50 fW -103 dBm
S5 -24 dB 3.2 uV 10 dBuV 200 fW -97 dBm
S6 -18 dB 6.3 uV 16 dBuV 790 fW -91 dBm
S7 -12 dB 13 uV 22 dBuV 3.2 pW -85 dBm
S8 -6 dB 25 uV 28 dBuV 13 pW -79 dBm
S9 0 dB 50 uV 34 dBuV 50 pW -73 dBm
S9+10 10 dB 160 uV 44 dBuV 500 pW -63 dBm
S9+20 20 dB 500 uV 54 dBuV 5.0 nW -53 dBm
S9+30 30 dB 1.6 mV 64 dBuV 50 nW -43 dBm
S9+40 40 dB 5.0 mV 74 dBuV 500 nW -33 dBm
S9+50 50 dB 16 mV 84 dBuV 5.0 uW -23 dBm
S9+60 60 dB 50 mV 94 dBuV 50 uW -13 dBm
(Zc = 50 Ohm)
S1 -48 dB 20 nV -34 dBuV 7.9 aW -141 dBm
S2 -42 dB 40 nV -28 dBuV 32 aW -135 dBm
S3 -36 dB 79 nV -22 dBuV 130 aW -129 dBm
S4 -30 dB 160 nV -16 dBuV 500 aW -123 dBm
S5 -24 dB 320 nV -10 dBuV 2.0 fW -117 dBm
S6 -18 dB 630 nV -4 dBuV 7.9 fW -111 dBm
S7 -12 dB 1.3 uV 2 dBuV 32 fW -105 dBm
S8 -6 dB 2.5 uV 8 dBuV 130 fW -99 dBm
S9 0 dB 5.0 uV 14 dBuV 500 fW -93 dBm
S9+10 10 dB 16 uV 24 dBuV 5.0 pW -83 dBm
S9+20 20 dB 50 uV 34 dBuV 50 pW -73 dBm
S9+30 30 dB 160 uV 44 dBuV 500 pW -63 dBm
S9+40 40 dB 500 uV 54 dBuV 5.0 nW -53 dBm
S9+50 50 dB 1.6 mV 64 dBuV 50 nW -43 dBm
S9+60 60 dB 5.0 mV 74 dBuV 500 nW -33 dBm
vy 73 de toby
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