[Elecraft] W2 Wattmeter

[NZ0T]

I'm very happy with my W2.  There was an issue with an intermittent in the
sensor cable but that was quickly resolved.  It seems accurate enough to me
on a subjective basis - I have no Bird to compare it to.  As far as
resolution goes the computer display resolution does rely on LED's and is a
continuous bar with a switchable peak indication.  This is only the 2nd
version of the diplay software and I'm sure it will continue to improve.  I
have a friend that has the LP-100A and it's a really nice meter but I'm not
sure I want to pay $120 more for it.

73 Bill NZ0T

Phil & Debbie Salas wrote:
> 
> "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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