Question about Power measurements
Posted: 25 May 2022, 06:08
Hi Guys I have a question to ask
I noticed that the output power measurements made with a dummy load applied to the antenna connector
they provide substantially different results when a small impedance transformer for wire antennas is applied instead of the dummy load.
In practice, what happens is that with the 50 ohm dummy load applied, the power efficiency reading is about 3 Watts with 70% efficiency.
By replacing the dummy load with a small impedance transformer for wire antennas, the power measurement rises to about 3.6 Watts with an efficiency of 72%.
I am sure of the quality of the measurement of the instrument (OLED) inside our small transceiver as I have verified by measuring the voltage across the dummy load that the watt indication is correct.
For the sake of completeness of information, I report that the measurements were carried out with a 12 volt power supply and between the transceiver and the small antenna tuner I use an rg58 cable of about 30 cm.
I noticed that the output power measurements made with a dummy load applied to the antenna connector
they provide substantially different results when a small impedance transformer for wire antennas is applied instead of the dummy load.
In practice, what happens is that with the 50 ohm dummy load applied, the power efficiency reading is about 3 Watts with 70% efficiency.
By replacing the dummy load with a small impedance transformer for wire antennas, the power measurement rises to about 3.6 Watts with an efficiency of 72%.
I am sure of the quality of the measurement of the instrument (OLED) inside our small transceiver as I have verified by measuring the voltage across the dummy load that the watt indication is correct.
For the sake of completeness of information, I report that the measurements were carried out with a 12 volt power supply and between the transceiver and the small antenna tuner I use an rg58 cable of about 30 cm.