> On Oct 26, 2015, at 10:56 AM, Paul Koning <paulkon...@comcast.net> wrote:
>
>
>> On Oct 26, 2015, at 10:45 AM, Jerry Weiss <j...@ieee.org> wrote:
>>
>> Water in the dummy load? Water cooled - sure. Water immersed? ...
> ...
> But for low voltage dummy loads, or for medium power ham transmitters, the
> voltages involved are not that high. Plain tap water is slightly conductive,
> but nowhere near as much as the resistors you're using.
Come to think of it, water immersed setups have shown up in the literature.
There was a nice article in QST a decade or so ago describing a 1296 MHz
kilowatt amplifier, built with a 3CX100A5 converted to water immersion cooling.
The setup included a clever trick to monitor the conductivity of the cooling
water, so you could swap it out if it got too conductive. The water there was
in direct contact with the anode, at around 2 kV or so. Worked fine apparently.
I never built anything like that but the appraoch seemed sensible.
paul
