W2 Directional Couplers

[KG5EJU]

100 Watt station with 2 antenna.  Need a second coupler of the W2.  First one is 200 watt, and thinking of adding a 2000 watt coupler for the second (future proofing for possible linear).  But, wondering if there is some accuracy/performance trade-off using a 2000 watt coupler on a 100 watt station?

Thank you for your thoughts.

73 - Dan
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[Phil Kane-2]

On 1/3/2015 7:31 AM, kg5eju wrote:

> But, wondering if there is some accuracy/performance trade-off using a 2000 watt coupler on a 100 watt station?

The FCC's standard for transmitter metering  is the minimum normal
reading cannot be less than 20% of the full scale reading for a
linear-scale instrument or 33% for a logarithmic-scale instrument.   For
a digital readout, the readout of the device must include at least three
digits and must indicate the value of the parameter being read to an
accuracy of 2%.

See FCC Rules Section 73.1215 for other details.

73 de K2ASP - Phil Kane
Elecraft K2/100   s/n 5402

From a Clearing in the Silicon Forest
Beaverton (Washington County) Oregon
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[Michael Eberle]

Dan,

With the 2000 watt coupler, you can still select either the 20 watt, 200
watt, or 2000 watt scales.  I doubt there would be any difference in
resolution by using the 2000 watt coupler with the W2 set for the 200
watt scale.  The manual specifies accuracy of +/- 0.5 dB typical for
both sensors.

Mike
KI0HA

On 1/3/2015 09:31, kg5eju wrote:
> 100 Watt station with 2 antenna.  Need a second coupler of the W2.  First one is 200 watt, and thinking of adding a 2000 watt coupler for the second (future proofing for possible linear).  But, wondering if there is some accuracy/performance trade-off using a 2000 watt coupler on a 100 watt station?
>
> Thank you for your thoughts.
>
> 73 - Dan
>

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[M0XDF]

I would have thought there is some difference, otherwise why go to the trouble of making two different models?
-73 de M0XDF

> On 4 Jan 2015, at 20:01, Michael Eberle <[hidden email]> wrote:
>
> Dan,
>
> With the 2000 watt coupler, you can still select either the 20 watt, 200 watt, or 2000 watt scales.  I doubt there would be any difference in resolution by using the 2000 watt coupler with the W2 set for the 200 watt scale.  The manual specifies accuracy of +/- 0.5 dB typical for both sensors.
>
> Mike
> KI0HA
>
>> On 1/3/2015 09:31, kg5eju wrote:
>> 100 Watt station with 2 antenna.  Need a second coupler of the W2.  First one is 200 watt, and thinking of adding a 2000 watt coupler for the second (future proofing for possible linear).  But, wondering if there is some accuracy/performance trade-off using a 2000 watt coupler on a 100 watt station?
>>
>> Thank you for your thoughts.
>>
>> 73 - Dan
>
> ______________________________________________________________
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>
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[Vic Rosenthal]

The 200W version has a low range that can measure power down to 0.1
watt. The minimum reading on the 2000W version is 1 watt.

On 5 Jan 2015 10:12, David Ferrington, M0XDF wrote:

>
> I would have thought there is some difference, otherwise why go to the trouble of making two different models?
> -73 de M0XDF
>
>> On 4 Jan 2015, at 20:01, Michael Eberle <[hidden email]> wrote:
>>
>> Dan,
>>
>> With the 2000 watt coupler, you can still select either the 20 watt, 200 watt, or 2000 watt scales.  I doubt there would be any difference in resolution by using the 2000 watt coupler with the W2 set for the 200 watt scale.  The manual specifies accuracy of +/- 0.5 dB typical for both sensors.
>>
>> Mike
>> KI0HA
>>
>>> On 1/3/2015 09:31, kg5eju wrote:
>>> 100 Watt station with 2 antenna.  Need a second coupler of the W2.  First one is 200 watt, and thinking of adding a 2000 watt coupler for the second (future proofing for possible linear).  But, wondering if there is some accuracy/performance trade-off using a 2000 watt coupler on a 100 watt station?
>>>
>>> Thank you for your thoughts.
>>>
>>> 73 - Dan

--
73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/
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