Volume 1
MIL-HDBK-162A
Section 3
15 December 1966
ITEM NAME: DIRECTION DATA CONVERTER
TYPE: PU-155/SP, PU-155(XN-1)/SP,
PU-155A/SP, PU-155B/SP
The Direction Data Converter translates these signals
TECHNICAL DESCRIPTION
into two synchro signals which represent the same
components. The synchro signals are used in the radar
Power Supply: 115v, 1-ph, 60 cps, 4 to
repeater to offset the origin of the PPI display in the
16 amps (depending on the number of
north-south and east-west directions in proportion to the
repeaters fed).
ships movement indicated by the signals. In this manner
Input Signals: Two 115v dc, 4-wire step-
the display, when once centered on a given reference
by-step signals from Dead Reckoning
point, remains centered on the same point regardless of
Analyzer; max power 26w. Total Dead
own ships movement.
Reckoning Analyzer speed 750 rpm.
Outputs: Synchro excitation for radar re-
peaters, 115v, 60 cps, 1-ph. Two 90v
RELATION TO SIMILAR EQUIPMENT
ac; 3-wire synchro signals to radar
repeaters; speed, 1 rpm.
The PU-155(XN-1)/SP and PU-155/SP have four sets
Heat Dissipation
of gears. The PU-155A/SP and PU-155B/SP have three.
PU-155(XN-1)/SP: 125w, max
Intermediate gear ratios differ but the final results are the
PU-155/SP, PU-155A/SP, PU-155B/SP: 88w
same in terms of gear reduction ratio. With the PU-155(XN-
1)/SP and PU-155/U the direction of rotation of remotely driven
INSTALLATION CONSIDERATIONS
synchros is the opposite of that which the PU-15SA/SP and
the PU-155B/SP, but can be made the same by an
Not available.
interchange of connections either at the step-motor or at the
synchro generator.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
SHIPPING DATA
COMPONENT
BOXES
OVERALL DIMENSIONS
UNIT WT.
(NR.)
(Inches)
(Pounds)
PU-155(XN-1)/SP, PU-155/SP
Direction Data Converter PU-155(XN-1)-P or
1
212
PU-155/SP
Spare Parts Box
1
10 x 16 x 22
75
PU-155A/SP
Direction Data Converter PU-155A/SP
1
16-3/4 x 22-1/2 x 27
170
Spare Parts Box
1
9 x 17 x 25
42
PU-155B/SP
Direction Data Converter PU-155B/SP
1
16-1/2 x 23 x 27-1/2
145
Spare Parts Box
1
3-5/8 x 4-3/8 x 7-3/4
4.0
PU-155/SP: 2
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