I have an SWR-001, which seems to be released under two different brands, MyDEL and Sharman. The MyDEL SWR-001 looks like this:
and the Sharman one looks the same except for the label on the bottom left (it looks like Sharman could afford a brand and MyDEL didn't):
In case I'm wrong about these two devices being the same, I have the first one, the one with the label SWR.
The feeder goes from my Icom IC-7300 to the SWR-001 and the SWR-001 in turn is connected to an LDG IT-100 autotuner (which also has the data lead to the IC-7300 for auto-tuning).
After finding an clear frequency, I set my radio to FM mode and 100W. I then set the SWR-001 Range to 300W, Function to CAL, and Power to FWD. I press the PTT and adjust the CAL knob until the needle shows 100W.
Is this procedure correct to calibrate the SWR-001 to measure the SWR?
Should I do it with the tuner turned on or off? The results are quite different and I don't know the theory behind the calibration procedure to be able to figure out what's going on on my own.
Also, it seems this calibration only works at a certain frequency or band and when I change to a different band I should re-calibrate. Is this correct?
This calibration has no effect on measuring power, does it?