Ian,
That just amplifies my distrust of wattmeters. If you were on a 100 watt
scale and the wattmeter spec is as good as 5% of full scale, you could
expect an error of up to 5 watts (either high or low) - most amateur grade
wattmetrs are speced for 10% of full scale (or even 20% in some cases), so
since you were only 2.4 watts in error, that wattmeter is doing pretty good
at the power range you were using.
An RF Probe or 'scope to measure the RF Voltage along with an accurate
non-reactive 50 ohm dummy load will provide much better accuracy (except
when the wattmeter has been properly calibrated at the power output that it
is being used to test the K2.
73,
Don W3FPR
> -----Original Message-----
>
> I haven't been too happy with the power output
> of my K2, but I didn't know if my vintage 1979
> Heathkit power meter is reading low.
> Today, I used an oscilloscope and measured
> 70.4 Volts peak to peak at 1.817 MHz into a
> 50 ohm dummy load with the meter indicating just
> under 10 Watts.
> I trust the calibration of the 'scope more than
> the meter.
> That 70.4 Volts peak to peak is 12.4 Watts;
> my Heathkit meter is reading low.
>
> Ian, G4ICV, AB2GR, K2 #4962
> --
>
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