Orbital Focus - International Spaceflight Facts and Figures
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SDS Satellites in HEO

Tyneside, UK
2022 Jun 27
Monday, Day 178

Maintained by:

SDS Tracking and Analysis:

Operational Frequencies

This is a list of all frequencies reported to be associated with known SDS satellites. Not all have been verified and some satellite names are tentative, based on circumstatial evidence when associating objects from Mike McCants's "classified.tle" file with known satellite names.

In addition, earlier SDS satellites in HEO also transmitted the AFSATCOM signal near 243.7 MHz. In recent years, only the transmissions from USA 125 and USA 137 have been logged.

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Freq (MHz) Satellite Mission Signal Type Notes