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[AMPS] Cantenna Dummy loads

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Subject: [AMPS] Cantenna Dummy loads
From: (Rich Measures)
Date: Wed, 3 Feb 1999 11:44:20 -0800

>Not knowing the innards of the Cantenna, may I suggest a quick test for
>the usefulness of simply a bigger can of oil.  The test would be to see
>if the sides of the existing Cantenna are warm after the "10 or 20
>seconds" at 2KW claimed to be the maximum before VSWR change. If the
>outside of the can isn't warmer than before the test started, then a
>bigger can filled with more liquid will not help.  


>It would seem that
>one would have to get the oil circulating around the resistor better to
>justify a larger reservoir.  My guess is the can surface will NOT be any
>Is it true that the Cantenna's VSWR changes appreciably after 10 to 20
>seconds of 2KW?
Pretty much, Mike, and the change seems to be permanent.  Typically R 
increases roughly 50% unless the resistor cracks.  However, if one needs 
a 75 ohm termination, why not?  


R. L. Measures, 805-386-3734, AG6K,  

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