Pat wrote:
On Tue, 15 Nov 2016 04:10:07 -0800 (PST),
wrote:
And increasing signal strength
meansUSING MORE ENERGY - something
the folks over at Alt.Video.Digital.Tv fail
to grasp.
You may fail to grasp it, too. When you hear about TV stations
(especially UHF stations) using millions of watts of power, they are
referring to ERP - Effective Radiated Power. That means the actual
power going into the antenna is much lower but the antenna has very
high gain. Rarely do stations use more than a few thousand watts of
actual power. The transmitter's actual power usage is a drop in the
bucket compared to all the other energy a TV station uses for lights,
cameras, HVAC, etc.
I was an engineer at an analog UHF station with a 5 MW EIRP, on a
1700' tower. The Comark transmitter used a pair of 65 KW EEV Klystons,
for 130 KW of RF into the diplexer. A third 65 KW Klystron was used for
the aural signal. That was in the late '80s, and our electric bill for
the transmitter site was $45,00 a month.
Solid state transmitters are modular, with around 1KW output, per
tray. Look at the Harris Broadcast website for some actual data.
--
Never **** off an Engineer!
They don't get mad.
They don't get even.
They go for over unity! ;-)