[Amps] DUMMY LOADS

[R.Measures]

>
>
>>Gentlemen,
>>
>>My paint can oil-filled dummy load does not provide
>>the time duration necessary to achieve perfect tuning
>>as it gets very hot and pops off the vent cap in addition
>>to changing its internal resistance.
>>
>>Who makes a 3KW or better dummy load that's
>>affordable?
>>
>>There are BC quality units available and they are
>>between 1 and 2 thousand dollars. 
>>
>>I would consider HB'ng a dummy load in a 5 gallon
>>metal bucket. 

***  This post contains a typographical blunder -- i.e., Bird's 
running-water cooled terminations are made from metal, Not  plastic.  The 
one I am planning to build is constructed from standard plumbing 
components and is mostly plastic.  
>
>**  The most practical way to cool a 50-ohm terminating resistor is with 
>moving water.  Bird Co. makes a series of terminations that do this.  A 
>sealed 3" ABS tube - with glued-on  inlet and outlet garden-hose fittings 
>- directs water around the resistor.  6-gallons per minute will carry 
>away at least 15,000W of heat.  To maintain constant Z with freq change, 
>a tapered conductor is placed parallel with the resistor - with the 
>widest spacing being at the coaxial RF connector end.   I currently have 
>a suitable resistor for building such a terminator on back order at 
>Kanthal-Globar.  I plan to use ordinary plastic pipe for the resistor 
>housing.  My estimate is that the cost of the plumbing material will be 
>under $10 per water-cooled terminator.  The water discharge can be used 
>to sprinkle the lawn or garden.  
>>
>>Your opinions and advice are always welcome.
>>
>>Hal
>>KA1XO 
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