[Amps] WATER for vapor cooled amplifier TSPA

[John T. M. Lyles]

You could do a simple test with a megger or a 
high pot tester and some plastic pipe, inject 
some current and see, through a couple of 
metallic fittings. But it won't be calibrated 
against any standard. At work I use Foxboro or 
Barnstead resistivity meters, that read from a 
few K ohm-cm to 18 Meg ohm-cm. That is as high as 
it gets with DI water, with few ions. The Rf 
systems I am responsibile for typically need 3-5 
Meg Ohm-cm water minimum to prevent significant 
leakage in the hoses.

John

>One of my businesses bottles and sell water in 
>one gallon jugs under our own name.  We also let 
>customers refill 1 gallon jugs.
>
>We process our tap water with a reverse osmosis 
>system.  No complaints so far, although we do 
>start with tap water that is right off the 
>mountain and crystal clear.  Some people feel 
>guilty drinking tap water, so they are willing 
>to pay out cash for the inconvenience of having 
>it in a bottle.  Profits from this "scam" 
>support amplifiers. 
>
>Need to check the conductivity sometime.  What 
>is good and bad conductivity, and can I use an 
>ohmmeter or do I need something special?
>
>Colin  K7FM
>
>-----Original Message-----
>>From: Paul Christensen <w9ac at arrl.net>
>>Sent: Feb 6, 2007 9:12 AM
>>To: amps at contesting.com, "John T. M. Lyles" <jtml at lanl.gov>
>>Subject: Re: [Amps] WATER for vapor cooled amplifier           TSPA
>>
>>>  condensation process. However, I would wager to bet that the cheapest
>>>  source would be used in bottled 'distilled' water for Walgreens
>>>  retail, and that sometimes you are getting DI instead of distilled,
>>>  hence the lower conductivity of the Zephyr hills brand. Call 'em up
>>>  and see?
>>
>>John,
>>
>>That's probably the case.  Perhaps what Zephyhills calls "distilled" goes
>>through a de-ionizing process.
>>
>>I've always wanted to know the difference between the various water types
>>sold on the grocery store shelves.  At the moment, I can easily purchase
>>distilled or "purified water," but I've never been able to find what the
>>exact differences are.  Probably a call into Zephyrhills is in order to know
>>for sure.
>>
>>Paul, W9AC
>>
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