Most, if not all analog measurement devices are spec'd at % of full
scale which can lead to high absolute variances if the levels being
measured are significantly below full scale. A Bird with a 100W slug
accurate to 10% of full scale [+/- 5W] would be within spec if it
indicated a real 10 W signal at 5 W. Many folks would say, "My K2/10
will only produce half the power it should." Most digital measurements
involve processing circuitry/computation, again which can introduce
errors in the lower end of a range, and be dependent on frequency as well.
Mathematics can be hard. Arithmetic can be tricky. [:-)
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 6/19/2018 3:25 PM, John Oppenheimer wrote:
Hi Scott,
I wonder how the linearity of the two power meters was evaluated?
Some years ago I checked the K3 and KX3 power meter against two other
meters. They were just within 10%
http://www.kn5l.net/Elecraft/Power.html
John KN5L
On 06/19/2018 04:56 PM, K9MA wrote:
I just repeated the linearity measurements, on both 40 and 15 meters. I
used the KPA1500 meter to measure output, and the K3 power setting for
input.
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