Re: Elecraft Digest, Vol 14, Issue 19 --- S-meter & S-units

Posted by Wa6bfh on Jun 16, 2005; 9:31pm
URL: http://elecraft.85.s1.nabble.com/Re-Elecraft-Digest-Vol-14-Issue-19-S-meter-S-units-tp379453.html

One very important consideration of the use of “S-meters”, and “S-units” is
 remembering that signals are heard as a “Square Law Function” Every time
you  double or lengthen the communications path by twice the distance, the
signal has  fallen to one-fourth, or a 6 dB change!
 
It is good to know how many dB per S-unit your receiver‘s meter indicates.  
This will probably not be a linear consideration -- and don’t believe the old  
wives tale about 6 dB’s per S-unit. It is the rare radio indeed where that is  
true!
 
Even better than using “S-units”, give other stations reports in (ACCURATE)  
dBm! You will need the use of a calibrated signal generator to assess your  
receiver.

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