Someone pointed to me that the Xiegu G90 has inconsistency in Tx power at various power supply voltages.
So, because I am a brave curious ham, I setup a quick test bench with some pieces of hardware laying around at my home lab.
The setup is pretty simple:
The radio firmware is:
The PC software was: R&S Power Viewer.
Note: The power sensor is working from 10 MHz so i measured the power from 10 MHz to 30 MHz. Below 10MHz, the results are pretty consistent at various voltages but I cannot hold them as being accurate therefore I removed them from datasheet.
The RF output power was measured from 9V to 16.5V and when i was playing around 9V i noticed a faint sound from inside the radio. The origin was determined to be the relays in the ATU path. Rising the voltage, they will switch around 9.3 V and will keep the contacts untill under 8.7V. Therefore, even the radio is able to work under 9.3V, there are reason not to do that because the voltage drop in SSB or CW will affect the proper function of various relays.
I choose 4 power levels to measure: 1W, 5 W, 10W and 20W. The results are in dbm. You can transform those values into W by using an online dbm to W conversion tool.
The radio was set in CW mode and a straight key was used to put the radio in Tx for the time reading was made.
I also made crude measurements for the Rx current and the Tx current (the last one, just the maximum values).
The voltage was tested against a VC-960 DMM which was then used to measure the current draw.
Here are the results in images. You can download the full test in pdf from the link at the bottom of the post:
Much interesting is how the Rx current is evolving on various bands!