Re: RETURN LOSS thoughts de k3eui
|
Traditionally, the B in dB is capitalized because it someone's name.? Alexander Graham Bell. V, A, W, F, H, C etc are also capitalized because the units are named after people, Volta, Ampere, Watt, Faraday, Henry, Coulomb...
toggle quoted message
Show quoted text
On Tuesday, June 29, 2021, 8:35:10 AM MDT, Cliff <kd4gt.tn@...> wrote:
»å±ð³¦¡¤¾±¡¤²ú±ð±ô noun a unit used to measure the intensity of a sound or the power level of an electrical signal by comparing it with a given level on a logarithmic scale. db is what I would call "unitless". It must always be referenced to some starting point. Sometimes we add a reference like dbm or dbW when talking about power. Loss is a negative situation. Gain is positive. If I "loose" $20 gambling, I subtract 20 from what I had in my pocket at the start of the game. But going to basic algebra, if I subtract a negative number, I actually add [100 - (-20) = 120]. An amusing story from the TelCo industry: A station engineer had low levels coming into the transmitter from the studio over the phone line. He had the phone company tech there trying to fix the problem. The engineer asked the tech to turn up the gain on the circuit. The tech said he was not able to do that. After more discussion, the phone tech allowed that all he could do was to turn down the loss. OK! Problem solved! |
Lou W7HV