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JGBOYLES wrote:
Hi, I am contemplating a pep reading wattmeter so I can check the output of my HB amplifier. Consequently, I am putting it right on the output of the amp. The output of the amp should always see 50 ohms because it will be feeding either a 50 ohm dummy load, or an ATU tuned to 50 ohms. With that in mind, I am simply using a resistive voltage divider, to get a voltage sample, and squaring it with an AD633 multiplier. This seems like a simple, cheap way to get watt info. assuming you will always be working into a near 50 ohm resistive load. Anyone see any reason why this will not give you a pretty good indication of your power output? I realize that the load may not always be exactly 50 ohms, and that there are losses in the ATU. The reason I have not tried getting a current sample and using the conventional VI COS Theta with the multiplier is due to the additional complexity of circuitry. It is also difficult to get accurate current samples over a wide frequency range. By making everything resistive it somewhat takes the frequency dependency out of the problem. Thanks. 73 Gary N4AST Good luck getting a straight answer here, and I won't try one, because every technical answer related to power transfer is always wrong by someone elses measure on this list. That being said, I'd do it the way you propose, since it's simple and repeatable, and probably close enough. tom K0TAR |
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