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ORI FPGA EVE Meeting: March 2025 Earth-Venus-Earth (EVE) Debrief
0:26 Successful Detection: Thomas from Dwingeloo reports partial success during the March 2025 EVE event. Using USRP B210s at Dwingeloo (transmit/receive) and Stockert (receive), they successfully detected CW signals bounced off Venus.
1:24 Moon Practice Paid Off: Prior practice bouncing signals off the Moon proved crucial for validating Doppler calculations, allowing near real-time analysis during the Venus attempt.
2:01 Special Setup: Dwingeloo obtained a special permit to transmit at 1000W and successfully installed a borrowed 1kW amplifier directly in the dish's front-end feed box.
4:15 Transmission Near Sun: The experiment occurred with Venus very close to the Sun (a few degrees), potentially impacting the noise figure.
5:56 Critical Equipment Failure: After successfully transmitting four CW signals (and attempting others), the 1kW Power Amplifier (PA) failed, likely due to overheating in the feed box. This prevented the transmission of planned complex waveforms (Zadoff-Chu, BPSK).
7:38 CW Results: Despite the PA failure, the four CW transmissions (278s each) were clearly detected at both Dwingeloo and Stockert, exceeding the pre-defined 4-sigma significance threshold.
8:40 Strong Signal & Station Comparison: The combined signal-to-noise ratio (SNR) was high (~2 dB S+N/N), surprisingly exceeding expectations. Stockert received the signal better than Dwingeloo, which requires further investigation.
9:33 Doppler Prediction Accuracy: The received CW signals matched the predicted Doppler frequency and Doppler rate with extreme accuracy, strongly validating the detection.
10:00 Link Budget Update: The successful CW detection provides crucial data points (from two sites) to refine the EVE link budget calculations.
12:58 DSS Attempt Unsuccessful: DSS (Deep Space Science) also attempted EVE transmissions, but their PA failed after only ~3 minutes, insufficient time for Stockert to integrate and detect the signal. Rick (DSS) reported their overall attempt was unsuccessful, citing architectural issues related to their ham radio-based setup.
14:05 Future Goal: Communications: Open Research Institute (ORI) and collaborators aim to move beyond simple radar detection towards actual communication by bouncing recoverable information off Venus, using waveforms like Zadoff-Chu or OTFS.
16:16 Next Steps & Moon Practice: With the next EVE opportunity in October 2026, the team plans to use the Moon for extensive practice, potentially using very low power (B210 direct to feed) to simulate the challenging Venus link budget and test communication waveforms.
18:04 Reflection Source: The reflection is believed to be from the surface of Venus (nighttime side for this conjunction).
24:14 Open Data: All collected raw IQ data (gigabytes) from Dwingeloo/Stockert will be sorted and released as open data for public analysis.
27:35 DSS Future Direction: DSS plans to re-attempt experiments using their science group's SDR-based architecture (similar to Dwingeloo/Stockert) and collaborate on Moon practice, leveraging their remaining budget.
31:40 Technical Investigations: Ongoing work includes investigating potential dish surface roughness issues (DSS) and refining system noise temperature measurements/calculations.
38:56 Collaboration & Outreach: There is a strong emphasis on continued international collaboration, potentially involving more sites (US East Coast, Australia) and organizing workshops before the 2026 window.