[Elecraft] Feature wanted for W2 wattmeter

[Phil Hystad]

Vic,

What do you mean by "delivered power"?  I presume you mean delivered to the antenna (aka antenna system) but are you thinking power input to the W2 minus all the losses.  By all losses I mean all losses on transmission line due to just plane old cable loss and higher losses due to higher SWR plus any loss in tuner or other devices between W2 and the aether.

Because, due to conservation of energy, that RF energy either goes out into Electromagnetic waves (radiated) or it ends up as heat-loss somewhere in the system.

And, given all that, I don't think any RF/SWR power meter on the market can measure "delivered power".

Or, are you talking about something else.

73, phil, K7PEH


> On Jan 12, 2015, at 11:31 AM, Vic Rosenthal 4X6GP/K2VCO <k2vco.vic at gmail.com> wrote:
> 
> I definitely want an LP100A, but I HAVE a W2, and while it is not as accurate, I still would like to see the delivered power!
> 
> On 12 Jan 2015 21:12, Jim Brown wrote:
>> On Mon,1/12/2015 7:56 AM, Vic Rosenthal 4X6GP/K2VCO wrote:
>>> I would like the W2 wattmeter to be able to display "delivered" power,
>>> that is, forward power minus reflected power.
>> 
>> You want N8LP's excellent LP-100A. I had lusted after one for quite a
>> while, and bought W6OSP's unit after he died for about half price. The
>> LP-100A supports two couplers, which can be deployed on the outputs of
>> both transmitters in an SO2R setup, or on input and output of a power
>> amp. The LP-100A measures the complex Z at the coupler, so it can
>> measure the input Z of the amplifier under dynamic conditions.
>> 
>> Now that I can measure power more accurately, I am able to run a dB or
>> more closer to legal limit when I want to for contesting.
>> 
>> 73, Jim K9YC
> 
> -- 
> 73,
> Vic, 4X6GP/K2VCO
> Rehovot, Israel
> http://www.qsl.net/k2vco/
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