Yes for years most companies have adopted the 6 dB per S unit and the 50 uV
for S-9 on HF. Collins some years ago used the 100 uV for S-9.
And then for some companies, a signal of some value caused the S meter to
move upscale to some value. Then more signal caused it to move upscale
more.
Fortunately most companies today do adhere to and have adopted the 50 uV for
S-9 as the standard and one S unit change is 6 dB signal change.
73
Bob, K4TAX
----- Original Message -----
From: "philip c anderson" <flypca@hotmail.com>
To: <tentec@contesting.com>
Sent: Tuesday, January 08, 2008 10:05 AM
Subject: [TenTec] STANDARDISATION OF S-METER READINGS
I hope I do not over step the purpose of this site but after all of the
dicussions about the isolation between Ant 1 and Ant 2 I thought that the
enclosed info might help put some actual values to the "S" meter readings.
I am sending a 2nd mail with more info fromanother source.>> > IARU Region 1
Technical Recommendation R.1> BRIGHTON 1981, TORREMOLINOS 1990> Page 1 of 1>
> > 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.> > > http://www.algonet.se/~k-jarl/ssa/IARU/smeter.html> >
For a 50 ohm systems this means S-9 is 50uV for HF and 5uV for VHF/UHF.> >
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