[Elecraft] KAT2 and CALS

[Phillip Heller]

I was actually referring to the SWR calibration step near the end of  
"Power Calibration" in the build document, which is against the 50 ohm  
dummy load.

However, it's really of no concern now, as I re-calibrated today  
against a different dummy load using a known accurate SWR meter and  
got 1.0:1 on all but 10m (where I got 1.1:1).

Thanks for the reply!

--phil

On Jan 24, 2009, at 8:29 AM, Don Wilhelm wrote:

> Phil,
>
> If the SWR after a TUNE is not low enough for your tastes, just try  
> doing it again, it often finds a better match.  There is also the  
> ALT setting which uses a more refined algorithm, but takes longer.
>
> It may also be that the load is outside the range of the KAT2 on  
> some bands - while the KAT2 has a wide matching range, it does have  
> its limits.  Very high impedance loads do give it difficulty.  You  
> can try adding or subtracting some feedline (1/8 wavelength at a  
> time for the band having difficulty) to see if you can produce a  
> better compromise antenna system input impedance.
>
> 73,
> Don W3FPR
>
> Phillip Heller wrote:
>> So I've completed the KAT2, so far so good.
>>
>> I get C55 to 003 +/- 2 (bounces back and forth).  R1 set per DL1   
>> calculation, R2 set with matching wiper resistance.
>>
>> CALS reports 1:1 on 80 and 40, though from 30 through 10 it  
>> reports  from 1.1:1 to 1.9:1 respectively.
>>
>> The documentation says not to expect 1.0:1 on the higher bands,  
>> though  1.9:1 does seem pretty high.
>>
>> Any ideas?
>>
>> --phil
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