Re: W2 Wattmeter
Posted by
Phil Salas on
Jan 02, 2010; 11:23pm
URL: http://elecraft.85.s1.nabble.com/W2-Wattmeter-tp4242517p4244199.html
"Those are good points about the trigger and perception of accuracy of the
W2. I have yet to see field test data of the W2 in regards to accuracy of
the
Wattmeter and SWR indications."
According to the manual the W2 has an accuracy of +- 0.5dB typical (nothing
about worst-case). This is 10-12% accuracy. Not as good as the
PowerMaster/LP-100A/Telepost class of wattmeters that use NIST-traceable cal
equipment (which should get you more like 3-5% accuracy). Of course, those
are $100-$150 more expensive than the W2. If you use the W2 LED display,
your perceived error could be greater than the 10-12%. As an example, if
you really have 100 watts and the W2 reads it 1/2-dB low, then possibility
only the 80-watt LED would light. So this would give you a 20% reading
error.
Maybe the ARRL will do a review sometime soon.
Phil - AD5X
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