I am currently using the BaoFeng UV5R+GX8500 (receive/transmit) U2V2 as my primary antenna, and the lactic acid bacteria and road bridge's communication status.
Note: The DM1701's OpenGD77 firmware includes built-in SAT auto-Doppler functionality.
Simply adjust the volume and noise reduction, set up the satellite, and then focus on the satellite's polarization spin during transit, making it easy to find the next signal.
Once the receiver is ready, adjust the transmitter to the VHF Doppler frequency of the AOS-1 phase, which is when the satellite has just launched.
If your area has already cleared the airspace, and you can confirm that no one is calling using a satellite like ISS, then…
Using CQ to transmit, rotate the Yagi antenna, increase the receiver volume, and you should be able to clearly hear your own voice on the receiver. Congratulations!
You have found the optimal uplink and downlink states for this satellite pass!
Generally, satellites passing through at angles of 60° or less do not exhibit rapid polarization rotation (except for SO50). If you observe unstable uplink performance,
If the rotation is not parallel, it means vertical; if it is not vertical, it means parallel. The polarization should be corrected to a perfect state.
20250621 UTC 18:55 (Beijing time 06:22:2025) ARISS maximum elevation angle 19°, multiple indoor obstructions in the southern direction.
QSO contact with station BG6HXD on frequency BI4ANH
This particular satellite pass was a low-angle pass that many new enthusiasts found unsettling, but the dual-frequency method perfectly solved this problem.
AOS 7° showed a clear downward trend, moving out of the obscured area and immediately began transmitting. The receiver did not respond with my voice, and the transmission was interrupted after broadcasting the call sign.
BG6HXD, please respond with a rotary Yagi antenna simultaneously. My voice transmitted to HXD via the receiver resulted in a successful QSO.
BI4ANH also called me, but due to their fast speaking speed, I was unable to fully transcribe and confirm. I asked BI4ANH if they heard a signal from the QRZ receiver.
After completing the reply, the successful QSO angles were 12.5°/9.3°.
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