> "Okay, so let's back up one step and sorta tabulate our findings
> and observations..."
A significant difference in the use of water with RF loads is that it is not
mixed with high-voltage and accordingly, probably no real reason to minimize
leakage, but immunity to long-term corrosion is important. Typically, in a
water-cooled load, water flows through a glass jacket which, surrounds a
50-ohm resistive element.
In my prior life, I used a 25KW Altronic water-cooled load on a Harris
FM-20K commercial broadcast transmitter. We simply ran a hose from the 46th
floor water tap and it remained that way for 15+ years without encountering
any trouble. In all fairness though, I believe the building (downtown
office complex) used a soft water system.
On the other hand, since the vapor-cooled amps require good HV isolation, it
would seem that the water requirements are much more restrictive with two
overarching requirements: (i) low water conductivity; and (ii) low corrosive
action. I am not sure what the right answer is but the Zephyhills product
labeled as "distilled" seems to work well with my Alpha 70V.
Paul, W9AC
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