[Elecraft] W2 wattmeter

[Stephen Selberg]

Thanks for all the feed back! Looks like I'll be taking the 30 minute drive
to Watsonville this week.

Steve KS6PD

On Saturday, June 15, 2013, Donald Butler wrote:

> I have two W2 meters and I like them  .. But I do not rely upon them for
> accurate power readings.. My more practical use is to use my peripheral
> vision to keep tabs on what's going on while I'm on the air and be alert
> for
> unexpected changes.
>
> I think the Bird 43, when fully calibrated, claims plus or minus 5%
> accuracy
> at full scale on their analog dial.
>
> The W2 is probably close to that, but not quite (maybe 6% at best) ...
> there
> are 17 leds on the 0-20 watt meter scale  .. Doing the math, on the 2KW
> scale, that's about 118 watts per LED ... so the power has to increase
> about
> 118 watts before the next LED will light up, etc., etc.    Yes, you can get
> a reading of presumed accuracy to the nearest watt if you us the W2
> software
> and keep a window running on your computer  . but the LED display itself is
> only capable of reading plus or minus 118 of actual wattage on the 2 KW
> scale.. And I've never bothered to calibrate to see what it takes for the
> next LED to light up .. Does it change when you (1) just cross the new
> threshold, (2) hit the midrange area of the next step, or (3) go the full
> distance.    Bottom line, it really doesn't matter, but I do not use a W2
> to
> obtain accurate power readings just from the LED display.
>
> Don, N5LZ
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net <javascript:;>
> [mailto:elecraft-bounces at mailman.qth.net <javascript:;>] On Behalf Of
> Fred Smith
> Sent: Saturday, June 15, 2013 8:28 AM
> To: 'NZ0T'; elecraft at mailman.qth.net <javascript:;>
> Subject: Re: [Elecraft] W2 wattmeter
>
> Bill is 100% right on about the W2,it is most useful on screen for extreme
> QRP if you don't have a WM-2 QRP meter. But like I said earlier it is very
> close for all ranges both of my couplers are 2k's but still not bad for
> QRP.
>
>
> 73,
> Fred/N0AZZ
> K3 Ser #'s 6730/5299--KX3 # 2573--K2/100 # 6470-KAT100
> P3/SVGA--KPA500--KAT500--W2
>
>
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net <javascript:;>
> [mailto:elecraft-bounces at mailman.qth.net <javascript:;>] On Behalf Of NZ0T
> Sent: Saturday, June 15, 2013 7:16 AM
> To: elecraft at mailman.qth.net <javascript:;>
> Subject: Re: [Elecraft] W2 wattmeter
>
> Very happy with my W2.  I have the 2KW coupler.  Seems pretty accurate and
> the LED display is great for casual use.  I don't always keep the display
> up
> on the computer but it's very useful when greater resolution than the LED
> display is desired.
>
> 73 Bill NZ0T
>
>
>
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