[Elecraft] Need KAT2 Help

[Don Wilhelm]

Tom,

You must obtain a low balance reading before you can do any *valid* 
power or SWR calibration.
If you cannot null with the capacitor, there is something wrong - 
normally that something is associated with T1 and the other wattmeter 
components, but you say you have checked those.

OK, the next logical step is to find out for certain whether you have a 
problem with the wattmeter or the L-C board.  Separate the Control board 
from the L-C board and place a jumper from J4 pin 2 to J5 pin 15 (yes, 
it is a long jumper - the second pin in from the far ends).  Now, with 
only the Control Board (you must use the ANT1 connector) - connect a 
dummy load  and again try to balance the wattmeter - if you find that 
the capacitor now achieves a null, look for the problem (likely a relay) 
on the L-C Board -but if you still cannot null the wattmeter, take 
another look at T1 and its associated components.

73,
Don W3FPR

KG3VTomZ at gmail.com wrote:
> Just finished assembling a KAT2 for my K2. When I started testing I found a  
> problem. I only get "HI" on the display in the CALn step, where you are  
> supposed to adjust for a reading of 000. Reducing power as low as I can go,  
> I can get a "000" display, but as soon as I increase the power, I get "HI".  
> I tried CALP and I did get readings that made some sense (a high value for  
> FWD and low value for REF power) but the FWD was something like 22 watts,  
> which seems too high.
>
> I disassembled and reveiwed the SWR bridge section, counted turns on T1,  
> removed the link on T1 and pulled up T1 to inspect the leads and soldering.  
> Also verified all the component values and soldering in that area.
>
> So my streak is over. Thought you just finished assembl, turned on power,  
> and all this Elecraft stuff just worked! Guess it had to happen.
>
> Any ideas/
>
> Thanks/73,
>
> Tom, KG3V
>   
>