[Elecraft] KPA 500 and ATU

[Brian Alsop]

On 4/8/2011 06:51, Jim Brown wrote:
> On 4/7/2011 6:18 PM, Johnny Siu wrote:
>> IMHO, ATU is nearly a must.
>
> That depends a lot on your style of operating, your antennas, your
> budget, and how much power you are willing to give away in the antenna
> tuner. ARRL lab tests have shown that some antenna tuners are a lot more
> efficient than others.
>
>
> 73, Jim K9YC

Indeed.  The biggest losses generally occur with attempts to match low 
impedance antennas. That usually means trying to match an electrically 
short antenna.  I suspect that is pretty common application.  Having the 
tuner remote eliminates most of the feedline loss but not this impedance 
matching loss.

Personally I'm not interested in having 100 -150 watts (out of the KPA's 
500) disappear as heat in the tuner.

I'd wait and see how the KAT-3 stacks up loss wise for the type of 
antenna situation you have.

73 de Brian/K3KO



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