3dB gain reference to what?
Without a reference decibel values are meaningless. With voltage, 3db gain
is a value greater by one half and is only applicable if the impedances remain
the same across the item of equipment you are measuring. When referred to
power, 3dB gain is greater by x 2 (double). Most of the measurements carried
out professionally in telecoms are related to power and do have a specific
reference such as dBm (reference to 1mW), etc. which makes life a whole lot
easier. Traditionally in the Cable TV industry the decibel is related to the
voltage at 75 ohms.
Bob, G3VVT
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