> I know that it doesn't take much water volume to cool a tube running the
> legal limit. A 1/2" tube with just a gentle flow is more than
> sufficient for 12 KW out CCS.
Very little water flow is needed from a cool source. Back in the '80s, I
managed an FM site atop what is now the Wells Fargo Building in downtown
Jacksonville. An Altronic Omegaline water-cooled load was used for testing
purposes. These cylindrical devices are only about a foot long and perhaps
4-5 inches in diameter. Contained within the metal shell is a single glass
resistor.
The water source? Simply a garden hose connected to a faucet and another
hose connected from the load and stuffed into a sink drain. A flow-valve
contained a set of contacts used in series with the transmitter's interlock
such that low flow resulted in the opening of the interlock -- which in turn
kills RF output. If flow is too low, the resistor will dissipate too much
power and ultimately fail.
The transmitter was rated for a TPO of 25KW and the load was rated for a bit
more than that. The first time you see it in action, it's difficult to
conceive that such a small load can safely dissipate so much power. But,
touch the exhaust water flow with your hands, and you'll feel a lot of heat.
It's nowhere near boiling with reasonable flow, just very warm.
Paul, W9AC
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