[Elecraft] [K2] KAT2 and SWR calibration

[Don Wilhelm]

Chip,

I have found many KAT2s that underreport the SWR.  There is no harm in 
setting the REFL pot to maximum if that is what it takes.  The KAT2 is 
not a precision wattmeter when it comes to SWR - the reflected power 
detected allows it to tune for an SWR minimum, no matter what that value 
may be - so the tuner function is not hurt even though the SWR reported 
is less than actual.

73,
Don W3FPR

On 8/15/2011 10:40 PM, Chip Stratton wrote:
> I have a recently obtained K2 with KAT2 module that I am trying to get up to
> speed. I'll have more questions and data later, but to start with I have a
> question about calibrating the SWR readings.
>
> After going through the procedures in the manual, I find that the KAT2 under
> reads SWR. When the load is 50 ohms resistive, it shows 1:1. When SWR is
> higher, e.g. an almost purely resistive 7:1  (according to a Rig Expert
> AA-230) the KAT2 reads 4.5:1
>
> I've calibrated forward power with a DL1 dummy load. Is there any problem
> adjusting R2 such that SWR on the KAT2 corresponds more closely to what the
> AA-230 reads?
>
> Chip
> AE5KA
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