Tag Archives: S-Band

Longjiang-2 S-Band Beacon received over 400000 km

January 10th, 2019

As I digged a little deeper, I learned, the source of the signal on 2275,225 is not Queqiao, but it is it´s companion Longjiang-2 or DSLWP-B in an orbit around the moon.

August 23rd, 2018

Designed as a relay for the planned chinese Chang’e 4 misson to explore the far side of the Moon with a lander and a rover, the Queqiao probe has reached it´s final destination 60000 km behind the Moon. There it is in a halo orbit with a radius of 15000 km around  the Langrangian L2 point of the Earth-Moon-system. So it won´t be covered by the Moon, seen from Earth.

Queqiao also carries a radio astronomy experiment for low frequency exploration in collaboration with dutch ASTRON. After the lainch in May 2018 two microsatellites Longjiang-1 (DSLWP-A) and Longjiang-2 (DSLWP-B) were released, to enter orbits around the moon. These satellites carry a radio astronomy experiment as well as amateur radio payloads. While Longjiang-1 went lost, Longjiang-2 is operating and can be monitored in the 70 cm band as well as in the S-Band.

The signal of the S-band beacon is audible at about 2275.225 MHz. The used equipment is HDSDR software with a RTL-SDR-Stick connected to a 13 cm ATV Converter (LO=916 MHz) and a 13 cm LNA (Kuhne) at a 23/13cm dualband ringfeed in my 3 m dish.