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"The antenna we use is a 6-element yagi; it is a commercially available cut-to-frequency channel 4 TV antenna sitting on the ground and pointed straight up," says Dr. Rob Suggs of the MSFC Engineering Directorate. "We use the CW demodulator on our Icom PCR-1000 so that 67.250 MHz (channel 4 zero offset) appears at about 700 Hz. This also inverts the passband so that the doppler shift of meteor echoes is reversed (frequency increases rather than decreases to the 'zero' frequency of the trail echo). The filter is set to 3 kHz bandwidth and the AGC is turned off." "The closest transmitters on this frequency are in Dothan, AL, Charleston, SC, Oak Hill, WV, Little Rock, AR, and Kansas City, MO." |