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2008-01-18

Information About the HAARP - LWA Moon Bounce Experiment


The HF Active Auroral Research Program (HAARP) in Alaska, and the Long Wavelength Array (LWA) in New Mexico, conducted a bistatic low frequency lunar radar experiment in October 2007. A brief description of the experiment and an example of the lunar echo radio waves received may be found in this press release.
HAARP and LWA are planning an additional lunar echo experiment for 19 and 20 January 2008. Interested radio amateurs and short wave listeners are invited to participate in this experiment by listening for the lunar echoes and submitting reports. The following table shows the planned schedule, where dates and times are in Universal Time (UTC):


HAARP-LWA Experiment Schedule

19 January 2008 05:00 - 06:00 6.7925 KHz
06:00 07:00 7.4075 KHz

20 January 2008 06:30 07:30 6.7925 KHz
07:30 - 08:30 7.4075 KHz

Based on the previous experiment, we believe it should be possible to hear the lunar echoes with a standard communications receiver and an antenna as simple as a 40 meter dipole. If you have a 40 meter beam antenna, point it in the direction of the moon. Other antennas may also yield acceptable results. The format for the transmissions will follow a five second cycle as shown in the following figure.

The HAARP transmitter will transmit for the first two seconds of the five second cycle. The next three seconds will be quiet to listen for the lunar echo. Then HAARP will transmit again for two seconds, repeating the cycle for the first hour using the first HF frequency. During the second hour, this periodic five second cycle will be repeated but using a different HF frequency as shown in the table above. Transmissions from HAARP during each two-second period, will be carrier only (no modulation). Therefore, listeners should use the CW mode on their receiver to hear HAARP and the lunar echo. We hope to operate this experiment using the frequencies given in the table above. However, depending on frequency occupancy at the time of operation, it may be necessary to adjust the frequency slightly.
Depending on ionospheric conditions, it may or may not be possible to hear the HAARP transmission via skywave. If conditons allow, the HAARP transmission will always be heard during the first two seconds after the five second cycle starts, for example, between 05:00:00 and 05:00:02 and again between 05:00:05 and 05:00:07. The lunar echoes will occur during the three second "quiet" period after HAARP transmits, for example during the interval 05:00:02 until 05:00:05 and again between 05:00:07 until 05:00:10. Depending on a number of factors, you may hear HAARP, the lunar echo, both or neither.
We are interested in receiving signal reports from radio amateurs who may be able to detect, or not detect, the lunar echo or the transmitted skywave pulse from HAARP. It will be helpful if your report includes your call sign and the type and location of your receiving equipment and antennas. Reports may be sent to the following address: mbreport@haarp.alaska.edu

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