[Elecraft] Accuracy of Wattmeter W2 under 2 Watt

[kk5na]

I use the NORTEX Accuprobe.  Nice inexpensive, versitile and very sensitive.

73, Joe KK5NA
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
On 10/25/2015 4:35 PM, Rick Robinson wrote:
> I don't have the paperwork in front of me but the Elecraft DL 1 dummy load
> has provisions to measure power up to 20 watts with a 10%  accuracy. Just
> use a dvm. They also make a WM1 that handles more power with a .5 dbm
> accuracy.
>
> On Sunday, October 25, 2015, Hajo Dezelski <dl1sdz at gmail.com> wrote:
>
>> Hello,
>>
>> I have been using a wattmeter from Fox for powers under 1 Watt, but
>> the display is too nervous and hard to read. So I stumbled over the
>> Elecraft W2 and read that with the 200 W sensor, you can read also
>> power levels under 2 Watt. This would be really helpful for I
>> experiment with power levels down to 0.5 mW.
>>
>> So before I invest, let me just ask some questions:
>>
>> 1. Has someone compared the power indicatores for the levels of 100 -
>> 1000 mW with a precise wattmeter? As far as I understood each led
>> signifies 100 mW.
>>
>> 2. If I would use the computer readout: How precise is the output?
>> Just 100 mW or ist it e.g. 147 mW?
>>
>> 3. I am working max. 10 Watt with the Kx3, but normally use only
>> between 100 mW and 5 W max. Could I adjust  with the calibration of
>> active sensor down to let's say 1 Watt instead of 2 Watt?
>>
>> 4. Is it possible to modify the transformer T1 and T2 of the sensor so
>> that the range would be (20W - 2 W and 200 mW. Or is there a sensor
>> like this available on request from Elecraft.
>>
>> I know a lot of questions, but as far as I can see this meter would be
>> a real champion for QRPP and could be used with a WSPR TRX.
>>
>> 73 de
>> Hajo (DL1SDZ)
>>
>> ---
>> Cela est bien dit, mais il faut cultiver notre jardin.
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>