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|  MIL-D-81347C(AS)
NOTE
For purposes of this discussion, control of the Light Off
Detector (LOD) channel in the receiver group will be
treated as any other processor channel unless otherwise
noted.
NOTE
To insure minimum receiver select time during computer
LOD and select operations, components used to filter and
delay manual select inputs to the SRL shall not have any
effect on the automatic select data.
3.5.1.4.7.2.1.2
Input - Input data to the computer shall be transferred via the
DIM. It is selected in (4) above, and is of three types:
(1) Manual Turning Data - This information is required to cor -
relate acoustic processor data with operating sonobuoys whenever the associated AN/ARR-72 receiver
is in the Manual mode.
(2) RF Carrier Level Data - This information is required to
select clear RF channels prior to sonobuoy launch and to confirm buoy operation following launch.
(3) Operating Mode - Computer selected Auto or Manual mode
status or Forced Manual mode status shall be passed through the SRL. The Forced Manual Mode indi-
cation also interfaces with the Status Logic.
NOTE
The Manual tuning data and operating modes (1) and (3)
above are monitored through the same gates that are
used for In- Flight Performance Monitoring (IFPM).
Receiver Interface - See Figures 32 through 34.
3.5.1.4.7.2.2
Sono Receiver Logic Outputs - The SRL shall output to the receiver
3.5.1.4.7.2.2.1
group the following:
(1) Six-bit parallel output in BCD format to each of 20 processor
channels, for channel selection control with data described in 3.5.1.4.7.2.1.1.
(2) One Auto/Manual Select line for each group of two six-bit
parallel outputs.
(3) One RF Request line via twisted wire pair per Figure 35.
Timing of the RF request pulse shall be concurrent with strobing of the Channel Select Storage Register
Sono Receiver Logic Inputs - The SRL shall accept the following
3.5.1.4.7.2.2.2
from the receiver:
(1) Two-bit parallel twisted pair inputs representative of RF
carrier level.
(2) Twenty sets of six-bit parallel Selection codes in BCD format
from the receiver group for purposes of manual charnel selection.
(3) One bit parallel twisted pair input from the receiver, indi -
eating completion of the A-D conversion function in the LOD Loop. This bit to be interpreted as LOD
valid.
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