Volume 1
MIL-HDBK-162A
Section 2
15 December 1965
ITEM NAME: TRANSPONDER SET
TYPE: AN/DPN-66
Duty Cycle: .002 max
RELATION TO SIMILAR EQUIPMENT
VSWR of Load: Built in ferrite isolator permits operation
AN/DPN-66
is
a
miniaturized
version
of
the
into a load VSWR of 3:1 (any phase) without system
AN/DPN-54.
degradation.
TECHNICAL DESCRIPTION
TRANSPONDER RECOVERY TIME: 50 usec max, for
input signal levels differing by up to 77 db. Recovery
RECEIVER
time is to full sensitivity with no change in transmitter
Frequency (tunable externally): 5395-5905 mc
reply power or frequency with three radars interrogating
Frequency Stability: plus or minus 2.0 mc
simultaneously.
Input Impedance: 50 ohms
Bandwidth (3 db): 10 plus or minus 2 mc
REPLY PULSE REPETITION RATE
Off-Frequency Rejection:
0 to 2670 pps - 0.75 usec pulse width setting.
Image: 60 db min
0 to 4000 pps - 0.25 usec pulse width setting.
Vhf, L, S and X Band: 70 db min
TRANSPONDER DELAY
Sensitivity: -70 dbm minimum over entire freq range.
Min setting: 2.0 plus or minus 0.1 usec
Maximum Input Signal: plus 20 dbm for operation
Max setting: 4.3 plus or minus 0.2 usec
within specification requirements.
Alternate: 3.2 plus or minus 0.5 usec (selectable by
Number of Interrogation Pulses: 1, 2 or 3
changing internal jumper lead).
Number of Codes: 4 total for 2 and 3 pulse code
groups (code selectable by externally accessible
DELAY VARIATION WITH SIGNAL LEVEL: 0.05 usec max
switch).
from -60 dbm to plus 20 dbm.
Pulse Width: 0.25-5.0 usec (single pulse), 0.25-1.0
LIFE: 150 hours
minimum
without
maintenance
or
usec (multiple pulse)
readjustment.
Pulse Spacing:
First 2 pulses - 3.5 plus or minus 0.1 usec (codes
POWER REQUIREMENTS
1 and 3) or 5.0 plus or minus 0.1 usec (codes 2
Wiring: Two-wire, remote grounded negative.
and 4).
Operating Voltage Limits: 24.5 to 30v dc
Third pulse - From 2.8 usec to 7.2 usec from
Operating current requirements (independent of line
second pulse (codes 3 and 4).
voltage):
Decoder Limits, first two pulses:
0.95 amps, standby.
Accept Zone - Plus or minus 0.5 usec from
1.40 amps, at 1200 pps reply rate.
nominal first to second pulse spacing.
1.75 amps, at 2700 pps reply rate.
Reject Zone - Plus or minus 0.7 usec from
nominal first to second pulse spacing.
INSTALLATION CONSIDERATIONS
Mounting: The transponder should be mounted in a
manner which will allow the positions of the selector
Frequency (tunable externally): 5400-5900 mc
switches to be observed.
Output Impedance: 50 ohms
Peak Power Output: 500 w min
Cabling Requirements: When installed, the power leads
Pulse Jitter:
to the transponder from the primary power source
Input signal minus 60 dbm to plus 20 dbm - 0.02
should not exceed 15 feet. The cables should be
usec max
properly clamped to the transponder mounting base
Input signal minus 67 dbm to minus 60 dbm - 0.05
to prevent excessive flexing at the connectors during
usec max
periods of vehicle vibration.
Pulse Width: 0.25 plus or minus 0.05 usec or 0.75
Related Equipments: The AN/DPN-66 is intended for
plus or minus 0.10 usec (selectable by changing
use with such precision tracking radar equipment as
internal jumper lead).
the AN/FPS-16, AN/FPQ-6, AN/TPQ-18 and
Pulse Rise Time (10% to 90%): 0.10 usec max
AN/MPS-26.
Pulse Fall Time (90% to 10%): 0.20 usec max
AN/DPN-66: 2
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