[Elecraft] W2 Wattmeter 440 band accuracy?

[N2ZDB at aol.com]

OK so I am trying to measure around 5 Watts or so on the W2's 20 Watt  
scale.  The spec's for the W2 directional couplers are listed at 0.5 dB  
accuracy.  Is this anywhere or just at full scale? How much could it  be off at 
only 25% of full scale?
 
Trying to decide if the 2.8 Watts I am reading at 440 MHz on high power is  
too low with a spec of 5 Watts output!  If it is I can send it back to the  
place of purchase to be checked and exchanged if necessary.
 
There seems to be no problem on the 2 Meter band at only 25 % of scale (5  
Watts) reading....just on 440.
 
Michael
n2zdb
 
 
 
 
 
 
In a message dated 07/30/2017 12:36:49 P.M. Eastern Daylight Time,  
elecraftcovers at gmail.com writes:

 


The accuracy of a Bird Model 43 is +/- 5% of full scale.  The meter  scale 
is not
linear and produces the best read accuracy in the bottom portion of the  
meter's 
scale.  


There are numerous watt meters on the market today that are more  accurate. 
 


FWIW  73!


Ken Kopp - K0PP

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On Sun, Jul 30, 2017 at 9:23 AM, Michael Walker <va3mw at portcredit.net> 
wrote:

The  only way to get the answer you wish is to compare it to a bench
standard  like a bird watt meter.

Beyond that you are just guessing.   Sorry

Mike va3mw


On Sun, Jul 30, 2017 at 11:18 AM,  Michael via Elecraft <
elecraft at mailman.qth.net>  wrote:

> Measurement is in analog mode.....should have made that  clear or not even
> mentioned a digital radio!
>
>  Michael