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Plate current measurement
On Jan 9, 8:41*am, "Antonio Vernucci" wrote:
In the AM transmitter I am building, the power supply is structured in such a way that it is not possible to measure the final tube plate current at a low-potential point. So I have decided to connect the tube cathode to ground via a 1-ohm resistor and measure the voltage that develops across that resistor. I know that, doing so, I will be measuring the sum of plate current (around 200 mA), screen current (around 20 mA) and grid current (around 7 mA). But tuning the transmitter Pi network for minimum total current should still work fine. Any comment? 73 Tony I0JX Rome, Italy You are exactly right..Be sure to bypass the the cathode resistor with something like a point 01 cap . Good luck W4PQW |
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