On 05/20/2019 05:38 PM, Carl Claunch via cctalk wrote:
On 05/19/2019 09:46 AM, Jon Elson via cctalk wrote:
There's a switch labeled "IRIG" which stands for Inter Range
Instrumentation Group, and refers to a standard for
telemetry encoding. There is a standard for time code, a
standard for modulating analog signas onto a bunch of FM
carriers, and a standard for multiplexing several analog
signals onto one FM carrier.
In this case IRIG stands for Inertial Reference Integrating Gyroscope, one
of three inside the Intertial Measurement Unit of the spacecraft.
Good GRIEF! Clashing acronyms. And, NASA certainly knew
about the other IRIG, as they used IRIG standards on a lot
of telemetry and radar systems.
Jon
