20 May
2019
20 May
'19
3:38 p.m.
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. This
adapter is used to test the PSA tray (Power Sub Assembly) which had modules
such as the Coarse Alignment Amplifiers that were used to drive and measure
the gryos (and the accelerometers).
It also drives the sextant optics for star sighting in the CM (thus you see
the knobs labeled Sxt Shaft and Sxt Trun) Those same circutis would be used
with the Rendezvous Radar for the PSA installed in a LM.
Apollo documents are probably VERY hard to come by
these days.
They are being rapidly and steadily digitized and made available. Many of
the PSA schematics are now accessible. The test point adapter itself is not
going to be easy to find, but you can find the wiring harness schematics
that would tell you what each of your 91 leads in the connector does.
Carl
21 May
21 May
7:50 a.m.
On 05/20/2019 05:38 PM, Carl Claunch via cctalk wrote:
On 05/19/2019 09:46 AM, Jon Elson via cctalk wrote:
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
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. 
9:53 a.m.
pritty much lol
On Tue, May 21, 2019 at 9:50 AM Jon Elson via cctalk <cctalk at classiccmp.org>
wrote:
On 05/20/2019 05:38 PM, Carl Claunch via cctalk
wrote:
On 05/19/2019 09:46 AM, Jon Elson via cctalk
wrote:
one
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, 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
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