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|  MIL-D-81347C(AS)
(9) Sono Receiver Logic - All acoustic processors in the P-3C
system receive their signals from the ARR-72 Sonobuoy Receiver. The ARR Sonobuoy Receiver consists
of 31 fixed tuned receivers, each providing an audio signal output. These 31 outputs are sent to the
switching matrix, the function of which is to switch 20 or less of them to 20 acoustic processing chan-
nels. Manual channel selection is accomplished through the use of nine remote Control/Indicator
Panels. These nine panels serve 18 of the 20 processing channels. The other two channels have no
manual control. Each half panel contains a thumbwheel capable of selecting one of 31 receivers, a
decimal readout to indicate which receiver is selected, an "AGC" indicator for that receiver, and a
Manual/Auto mode lamp. The SRL provides an integrated Computer/Manual tuning mode for the 31
receivers used in this system. This will allow the following operating modes:
(a) Computer control of the ARR-72 Switching Matrix with
indication of channel status given to the operator.
(b) Direct operator control of the Switching Matrix with indication
of the channel status given to the computer.
Additional control shall provide both computer selection of either
mode, and manual overrides to force the SRL to mode (b) above. An additional requirement is to
make it possible for the computer to monitor all RF activity within the ARR-72 spectrum. This allows
the computer to select RF channels prior to launch, and to monitor sonobuoy operation (light-off) im-
mediately after launch.
The logic provides logical signals so that the 20 acoustic proces-
sing channels may be switched to the desired RF channels. Additionally, one output channel is pro-
vided for the TACCO. The Light Off Detector Logic serves to provide logical signals to the matrix in
order to call up the desired RF level (AGC) signal.
(10) Auxiliary Readout (ARO) Display Interface Logic - The ARO
Display Interface Logic provides the interface between the computer and Auxiliary Readout Displays.
The Auxiliary Readout Display provides a means for displaying computer generated tableau information
on a Charactron-type display. One ARO is located at the TACCO Station and the other ARO is at the
NAV/COM operator station.
Logic Unit 2 Functions - The subunits of Unit 2 shall perform the
3.4.8
following system functions :
(1) Digital Magnetic Tape Subsystem (DMTSS) - The Digital
Magnetic Tape Subsystem shall provide rapid retrieval of supplemental programs required during the
mission, such as classification programs; and rapid interchange of operational programs with systems
tests, integration tests, and diagnostic programs. The subsystem shall also record in-flight data
(events) for use in post-flight data reduction and analysis.
The Digital Magnetic Tape Subsystem shall consist of a Mag-
netic Tape Subunit and a Magnetic Tape Transport.
(2) Armament/Ordnance Input Logic - The Armament/Ordnance
Input Logic shall transmit to the computer an Armament Status Word which notifies the computer of `
the Armament and Ordnance System Status or Change of Status, i. e. ,
(a) Readiness of Search and Kill Store Weapons
(b) Change in Status of these Search and Kill Store Weapons
(c) Recognition and transmission of an error or malfunction
in the Subsystem operation,
(d) Launch indication of Search and Kill Store Weapons.
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