Stray Powermid Signals
Why does the red light on my Powermid sometimes flicker?
There can be two possible causes for this depending on which Powermid has the flickering light:
If the ST539 (the one without the antenna) has a flickering Light Emitting Diode (LED) it means it is picking up stray infrared (IR) interference from somewhere. There is infrared light in sunlight so the first possible cause could be that the ST539 is positioned so that direct sunlight falls on it. If this is the case, try moving it out of the sunlight. A second cause could be that it is placed directly under and lamp. Incandescent lamps also emit a certain amount of light in the infrared wavelength. Again the solution is to move the ST539 away from the lamp.
If the RE549 (the one with the antenna) has a flickering LED, it means it is picking up some stray Radio Frequency (RF) interference. If the RE549 is placed on top of a TV it might pick up some interference from the TV. The solution is to move it a few inches away from the TV.
If both the ST539 and the RE549 have flickering LEDs, it might be that the ST539 is picking up some stray infrared light, converting the IR noise to RF noise and transmitting it to the RE549, causing its LED to also flicker. The solution is to unplug the ST539 and see if the LED on the RE549 stops flickering. If it does, move the ST539 away from the source of IR light (table lamp, direct sunlight, etc.).