[Amps] SS amps watercooling - was PowerGenius XL

[Big Don]

Might run another experiment to see how conductive initially distilled
water becomes after spraying it onto the inside of a cabinet, and on some
circuit boards. Collect the drainage in a pan, which now contains any
impurities picked up along the way, and check the conductivity now......
Don  N7EF

On Tue, Feb 21, 2017 at 7:22 AM, Jim Thomson <jim.thom at telus.net> wrote:

> Date: Mon, 20 Feb 2017 19:05:27 -0500
> From: "Ray, W4BYG" <w4byg at att.net>
> To: "amps at contesting.com" <amps at contesting.com>
> Subject: Re: [Amps] SS amps watercooling - was PowerGenius XL
>
> FYI:  I'm afraid I have to disagree on the statement below about
> distilled water being conductive.
>
> In industrial experiments in the use of distilled water,  I found it to
> be very non-conductive.  If I recall correctly, it has a measured
> conductivity of 50 to maybe 100 micro-Siemens per centimeter squared.
> That's not much.  Pure water becomes conductive only if it becomes
> contaminated with salt like contaminates.  For a comparison, seawater
> typically measures in the thousands of micro-Siemens per centimeter
> squared, because of the high salt content.
>
> While working on a clients project to do so, I spent many hours
> attempting to inject RF into water of various solutions.  It was very
> difficult in the lab trying to get RF to propagate thru pure water.
> Other more contaminated solutions not so much..
> 73,
> Ray, W4BYG
>
> ##  re-read the post. Neither roger nor I said distilled water is
> conductive.
> I got out 2 identical plastic caps, and filled one with new distilled
> water,and
> the 2nd one with tap water from the kitchen sink.   Then stuffed the fluke
> 87a
> probes into each one.... dried off between tests.  Distilled water reads
> sky high
> resistance... vs  tap water.   Thats good enough for me.  Distilled water
> is dirt cheap
> to buy and would make an excellent coolant for water cooled LDMOS.   Dunno
> how often it would have to be changed out.   Even if it was every 6 months
> to a year,
> or even far less, who cares.  Simple procedure.
>
> Jim  VE7RF
>
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