[Elecraft] [KAT] Circuit operation question

[dean at jonemail.com]

Hi Don,
     Thanks for the confirmation.  Yes the little ATU works fantastic on
my antenna.  Worked Sweden this weekend with only 1 watt to my dipole! 
I understand the ATU's circuit now which is what I was trying to do.  I
am glad that I am not loosing my mind!

Dean


Dean,

I never noticed before, but you are correct. The schematic does agree 
with the board layout too, so the firmware is apparently moving the 
relays to the set position to bypass the inductors.

What I can say is that it does work properly!

73,
Don W3FPR

On 11/26/2012 7:45 AM, dean at jonemail.com wrote:
> Hi all,
> I have a question about the circuit of the KAT1. According to the
> manual, page 12, if the circuit is put into either the ATU CLS or CLP
> modes, all the relays are RESET to all L=0 and all C=0. No problem
> here. Now if you go to the circuit schematic at the end of the manual,
> you will see a note at the bottom left that saysa all relays are shown
> in the reset position. Here is my problem and question; I agree that
> the lower relays for the capacitors are all in the so-called RESET
> postion as all caps are out of the circuit and therefore all caps are
> set to C0. However, tracing out the 4 inductor relays shows that they
> are ALL IN the circuit [all inductors (5uH total)connected in series] in
> the shown RESET position. To me, being set to L=0 means that the relays
> should be shorted out and the KAT1's path from P2 pins 2 and 10 should
> be direct or straight through. I believe that those 4 inductors are
> really shown in the IN position not the RESET position as declared on
> the schematic. Am I correct or just don't understand?
>
> Thanks,
> Dean
> K6DDJ
>