Re: high-power tuner

Posted by k6dgw on Mar 09, 2012; 11:14pm
URL: http://elecraft.85.s1.nabble.com/high-power-tuner-tp7314904p7359902.html

On 3/9/2012 2:24 PM, WILLIS COOKE wrote:

> If you need a tuner, your
> antenna does not meet this criteria so, what are you using to form
> your opinion?

Weigh the tuner, then transmit continuously, measure the temperature
rise, and when it's stable, calculate the heat loss [something to do
with Boltzman's Constant -- the tuner *is* painted black].  What doesn't
leave as heat must leave as RF.  Did it years ago on a 10 KW FM
broadcast transmitter [4 ea 4-1000's], and it came within one percent of
the efficiency measured with the water-cooled dummy load.  YMMV however.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2012 Cal QSO Party 6-7 Oct 2012
- www.cqp.org

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