I'll have to admit that as of yet, I have not seen a definitive
empirical standard for an s units value BUT, to back up Rod's
statements, I offer this quote from an owners manual to a Hallicrafters
SX-117 Receiver Circa 1962.
(pg.11 pp 5-5)
"The S-Meter is calibrated in S-Units to 9 and in decibels to 70db over
S-9.
S9 represents a 50-microvolt signal at the antenna input. Each S-unit
represents approximately 6 DB change in signal strength."
Roger KD6CC
Roderick M. Fitz-Randolph wrote:
>
>
when I first became interested in
> ham radio, virtually everyone you could have met would have told you that
> an "S" unit was 6 dB.... that is, by definition, not practice.
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