In an FM-CW radar system, a frequency modulating said modulating wave output from said modulating signal generator has a frequency variation skew with respect to a time axis, and the radar system includes a means for varying the modulation skew by controlling the modulation frequency amplitude or modulation period of the modulating signal. The construction includes a first panel defining an aperture, a bubbled sample packet partially protruding through the aperture, and a base panel adhered to the top panel to sandwich the sample packet between the top and base panels. First flush is discharged from the first discharge and is filtered before reaching the storm drain. The printed conductive line has a first end for connection to the digital andor transceiver circuits via a transmission line, and a second un-terminated end. Thereby, hanging ornaments enhance the entertaining value of the candle topper.