The original S meter development for HF radios was done by Art Collins.
At that time the number used was 100 uV for S-9 to coincide with the RST
system. Later the value was revised to 50 uV for S-9. Values above S -
9 are stated usually in dB although I've seen some in microvolts. If
one ventures into the VHF spectrum then the value changes. {I forget to
what value}
73
Bob, K4TAX
On 11/18/2015 3:31 PM, Fred Jensen wrote:
I believe there's more than one correct answer. In earlier times, the
"Collins Standard" was 6 dB/S-unit and 50 uv = S9. My 75S3 came in at
53 uv for S9, and pretty much held to the 6 dB/S-unit below that. Not
so much above S9
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