[Elecraft] K2 power output measurement accuracy?

[Larry Phipps]

It's a standard diode peak detector I believe, so it would indicate 31.7 
VDC (minus the drop) at 10 W for a 50 ohm load. I expect the drop is 
about 0.3 V.

Larry N8LP



Darwin, Keith wrote:
> Thanks Don,
>
> So with my basic K2, I should get agreement between the K2's setting and
> its output when driving my 50 ohm dummy load.  I'll check it that way
> and report back.
>
> I never completed the RF probe with the K2 (didn't need it).  I assume
> it simply converts RF AC voltage into DC voltage (probably RMS) so you
> can measure it with a DVM, right?  So at 10 watts into a dummy load, I
> should see 22.4 volts?  Does the diode drop some voltage so I'll
> actually see 21.7?
>
> There is so much I don't know about this stuff since rig since it went
> together with no problems and worked fine the first time.  It didn't
> give much opportunity to do any trouble shooting.  Gee Darn :-)
>
> - Keith KD1E -
>
> -----Original Message-----
> From: Don Wilhelm [mailto:w3fpr at earthlink.net] 
>
> The basic K2 power ouput indication is very accurate when operating into
> a 50 ohm non-reactive load.  If it is driving anything other than that
> load, the indication will be inaccurate - the basic K2 does not have a
> wattmeter, it does have an RF Probe type detector which reports the RF
> Voltage to the microprocessor and the 'power' is computed based on the
> assumption that the load is 50 ohms.
>
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