First, check if the machine emits radio frequency signals. You can do this by measuring the standing wave ratio using a spectrum analyzer, observing the transmission current, or checking the JTDX software display.
If there's power available, try calling nearby stations in China or Japan. If you can get through, it means at least the signal is being transmitted.
You can visit https://pskreporter.info/pskmap.html to view shortwave signal reception reports and see how far your signals reach. Then, combine this information with propagation patterns and predictions to get a general understanding.
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