On Sep 24, 2004, at 6:16 AM, Michael Tope wrote:
----- Original Message -----
From: <r@somis.org>
Michael -- Have you ever measured the resistance of an MFJ or Heath
Cantenna After 1-minute of NØN (hammer-down) at 1500W?
No, not directly, but VSWR didn't appear to change appreciably when I
ran
1 minute key down test last week. This suggests that the resistor value
remains reasonably stable.
I agree. Thanks.
The oil gets damn hot, however :)
Setting the Cantenna in a bucket of water helps.
Seems like
conduction cooling between the can body and a water bath
would be of some benefit.
In a long test, yes, but the main problem is bubbles forming in the
cooling oil at the surface of the resistor.
cheers
The other thought I had was to snake copper cooling tubes into the
oil reservoir to form a heat exchanger. Also has anyone tried active
stirring of the oil to reduce localized heating of the oil near the
resistor
surface? Just random thoughts.
73 de Mike, W4EF...........................
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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