[Elecraft] W1

[Bob Novas]

Ed - What are you putting the output power to --  a dummy load or an
antenna?  Do you have the KAT internal antenna tuner?  If there is an SWR on
the antenna line that the KAT is tuning out for the transceiver, then the W1
will read forward power and reverse power on the antenna line whereas the K3
will read output power.  If you subtract the W1's reverse power reading from
the W1's forward power reading, does that compare to the K3's power reading?
Try reading the two power meters into a good dummy load. Then the K3 reading
and the W1 forward reading should be equal. Bob - W3DK

> -----Original Message-----
> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Ed
> Lambert
> Sent: Thursday, December 31, 2015 6:33 AM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] W1
> 
> It is probably necessary to restate my question with more precision.
> 
> 1.       I have calibrated the K3s using Elecraft K3 Utility
> 
> 2.       I have carefully calibrated the W1 using the DDM method with a
good
> quality DDM.
> 
> 3.       Comparing the results, I see that the W1 consistently calculates
> power about 1 dB higher than the K3s. Statistically, I would have expected
them
> to be closer. From the W1 specifications, and not knowing the K3s power
> accuracy specifications, it seems that, possibly, the K3s is displaying
about 3
> sigma low and the W1 3 sigma high, which is unlikely.
> 
> 4.       The question: Should the K3s be calibrated from the W1 or should
> the W1 be calibrated from the K3s?
> 
> (There could be a detailed, separate discussion of the meaning of
"average"
> power and "PEP" as used in the W1 programming reference. It is my belief
that
> the two should be the same thing if using a cw signal and the FCC
definition of
> "PEP". It would be interesting to know what is going on in the K3s
transmitter
> gain calibration process. It seems like there is an internal power
measurement
> process and the gain is being set against that. Does that internal
measurement
> process have accuracy equivalent to the W1 or vice
> versa?)
> 
> 
> 
> Ed
> 
> KD3Y
> 
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