[Amps] WATER for vapor cooled amplifier

[Robert B. Bonner]

Yep exactly DI water is mostly for use in laboratories, you would need to
specify the dielectric capability with the water company.  They should know
everything. Just as quality distilled water is important.

YOU CAN'T just plop real DI water into any container or system. See my
previous post on types of water as it will INSTANTLY ATTRACT ions from a
metal or plastic container.

I cant believe the XMTTER Manufacturer recommended it!!!! The conductivity
was probably the silver instantly pulled off the tube itself and
contaminating the water!

Some of these water companies just get by...  Sounds like Zephyrhills has
their poop in a group.  We can buy it in the grocery stores here... Cheap

BOB DD

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Dan Elyea
Sent: Tuesday, February 06, 2007 12:28 PM
To: amps at contesting.com
Subject: [Amps] WATER for vapor cooled amplifier

My place of work is an HF transmitting facility.  We have a number of
100 kW transmitters using the vapor phase cooling approach.

Back in 1977, when we brought the first one on the air, we were having a
problem locating distilled water within reasonable driving distance.
Distilled water is the recommendation from the manual. (Each transmitter
requires about 75 gallons.)  After consulting with one of the
manufacturer's engineers, we filled up with deionized water (which was
readily available).  The resistivity was very low---totally unsuitable
to hold off the HV.  (Perhaps "de-ionized" water comes in several
varieties of quality.)  Anyway, it appeared to be bad advice.

We had to drive the long distance to get the distilled water, and flush
the system out to get the resistivity readings that were acceptable.

We now use Zephyrhills distilled water, and find it completely
satisfactory in terms of resistivity and holding off 12 kV of HV.

73, Dan  K8YKO



> Message: 1
> Date: Tue, 6 Feb 2007 10:03:08 -0700
> From: "John T. M. Lyles" <jtml at lanl.gov>
> Subject: [Amps] WATER for vapor cooled amplifier           TSPA
> To: amps at contesting.com
> Message-ID: <p06230900c1ee62483339@[128.165.34.51]>
> Content-Type: text/plain; charset="us-ascii" ; format="flowed"
> 
> Paul
> Deionized water is what you have to use for high resistivity water.
> Distilled is not acceptable as the ionic content is now low enough.
.


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