[Elecraft] Feature wanted for W2 wattmeter

Phil Wheeler w7ox at socal.rr.com
Tue Jan 13 00:24:34 EST 2015


Sounds like a plan, Vic :-)

BTW -- did you manage to get that antenna repaired?

73, Phil W7OX

On 1/12/15 9:09 PM, Vic Rosenthal wrote:
> So why do I need an amplifier? I can just double my power by detuning my antenna tuner!
>
> Vic K2VCO /4X6GP
>
>> On Jan 13, 2015, at 6:54 AM, Walter Underwood <wunder at wunderwood.org> wrote:
>>
>> All power ends in a load.
>>
>> Forward and reverse power measures standing waves, but all those waves go into some kind of load. Nearly all of it, if you are lucky, goes to the antenna. The rest goes to heat. Forward and reverse is just a way to measure standing waves. It does not mean the some percentage of “reverse power” is disappearing into your power amplifier.
>>
>> If you are running legal limit into forward power, you are quite likely running illegal power into the the antenna.
>>
>> I was happy to get a C+ in my fields and waves class at Rice, but I do understand this stuff.
>>
>> wunder
>> K6WRU
>> CM87wj
>> http://observer.wunderwood.org/
>>
>>> On Jan 12, 2015, at 8:32 PM, Vic Rosenthal <k2vco.vic at gmail.com> wrote:
>>>
>>> I'm talking about forward minus reflected power. If you neglect losses, that is how much power gets to the antenna to be radiated. A wattmeter that measures forward power will be misleading if the SWR is high. My antenna has an SWR of about 2.5:1 on 40 m. When the transmitter delivers 100 watts to the line, there is about 120 watts forward and 20 watts reflected. I want a mode in which the wattmeter reads 100 watts in this situation.
>>>
>>> Maybe 'delivered' is a bad choice of word. I mean something like 'power delivered by the transmitter'. Obviously it would take magic to know how much power gets to the antenna after losses!
>>>
>>> Vic K2VCO /4X6GP



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