[geocentrism] Re: radiated power.
- From: "Gary Shelton" <garylshelton@xxxxxxxxxxx>
- To: <geocentrism@xxxxxxxxxxxxx>
- Date: Sun, 17 Apr 2005 19:51:32 -0500
Philip,
I guess I'm as dumb as a box of rocks on the subject of antennas and gain and I
will be making clear by this question how precious little I really know, but
when you are adding 10dBW to a 9dB gain, you are adding ten watts to something
a bit less, say 9 watts, and it equals 80 watts?
Can you give me a primer link on the stuff, Philip?
Thanks,
Gary
I hope this helps... Phil
30dBW is a thousand Watts.
Q: What is a dBW?
A: The decibel is a way of expressing the relative power of something compared
to a standard, usually electrical power, current or voltage, or sound levels.
In this case it is electrical power relative to one Watt. The decibel is a
logarithmic unit, so 10dBW is ten Watts, 20dBW is a hundred Watts and
30dBW is a thousand Watts.
In the European union, the power output of radio transmitters are expressed in
dBW's by the licensing authority. In the U.K. this has replaced the old system
of quoting transmitter power in Watts. Aerial gain is expressed in dB's, so
assuming no feeder loss a 10dBW transmitter connected to an aerial with a 9dB
gain would radiate an effective power of 10+9 = 19dBW (80 Watts).
GaryLShelton@xxxxxxxxxxx
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