Transit 5B-5

From Signal Identification Wiki
Jump to: navigation, search

Transit 5B-5 Telemetry
Transit5B5.PNG
Frequencies 136.658 MHz
Frequency Range 136.658 MHz - 136.658 MHz
Mode WFM
Modulation PAM,FM,PM,PCM
ACF
Bandwidth 32 kHz
Location Worldwide
Short Description Transit 5B-5, a former TRANSIT navigation satellite, is the oldest satellite known to still transmit a signal. Considered "dead" because its navigational systems failed after 19 days of operation, it still emits a telemetry signal when illuminated.
I/Q Raw Recording
Audio Sample

Transit 5B-5 (COSPAR object 1964-083D), a former TRANSIT navigation satellite, is the oldest satellite known to still transmit a signal. Considered "dead" for many years because its navigational systems failed after nineteen days of operation, it still emits a telemetry signal on 136.658MHz when illuminated by the sun. The signal is similar to that used by later TRANSIT satellites, but with some differences, presumably due to damage to the encoder circuits. Its distinctive, almost musical sound is the product of an old form of analog spacecraft telemetry system that represents the monitored readings as the deviation of a sub-carrier oscillator from its center frequency. The rhythmic "ticking" audible in the background is produced by the PCM portion of the signal that encodes digital data.

Samples[edit]

TRANSIT 5B-5 as heard in single-sideband mode:

Occasionally, when there is not enough light hitting the solar panels, it produces the following sound (received in upper-sideband mode):

Additional Links[edit]

Additional Images[edit]