Adapter 2A2CP8 enables connection of 2W7 / 2W8 to
testing the circuits within the antenna pedestal.
J5 on the hybrid attenuator.
To operate the interface adapter unit proceed as follows
a. Connect the interface adapter unit to facility
To avoid damage to the equipment
b. Connect the interface adapter unit in the desired
under test DO NOT energize the
test configuration with cables of the test facilities set.
c. Set the GROUP CASE POWER 60-HZ and 400-
terminating jacks J2 and J3.
HZ switches to ON.
c. The insertion losses marked on the tag attached
d. Set the GROUP CASE POWER SELECT witch
to the hybrid attenuator, and marked on the connecting
to the desired position.
coaxial cables should be considered calculating the
e. Apply power to the interface adapter unit by
setting POWER switches to ON and setting the
FREQUENCY SELECT switch to the desired position.f.
Typical Connection and Use of Minor
To monitor signals at the test jacks, connect appropriate
external test equipment to the test jack of interest.
Certain of the minor components of the test facilities set
g. To test antenna pedestal circuitry, set the SYNC
are standard, general purpose adapters terminations.
/RSLVR SEL switch to the appropriate position
These components are used in a number of test setups
required when performing maintenance on the IFF set.
To avoid damage to the equipment
Included in this category are adapter 2A2CP7 (N-female
under test, DO
to N-female adapter, type UG-29B / U), adapter 2A2CP8
SYNC/RSLVR SEL switch to SYNC
(N-male to BNC-male adapter, type UG-1034/U),
position when the antenna pedestal
termination 1A1AT2/1A1AT3 (75-ohm dummy load, type
DA-559), and termination 2A2AT4/2A1AT5 (50-ohm
dummy load, type DA-558). General instructions for
h. For resolver operation, set AZIMUTH DATA
connecting the remaining minor components of the test
FREQ SELECT switch to 4000 HZ. For synchro
facilities set are provided below.
operation, set AZIMUTH DATA FREQ SELECT switch to
either the 60 HZ or 400-HZ position.
Extender Boards and Printed Circuit Board
i. To simulate antenna rotation, set ANT
ROTATION switch to CW or CCW.
ROTATION switch ON, and set RPM CONTROL to
(1) Printed circuit (PC) board extractors 1A1A2 and
desired antenna rotation speed..
2A3 are used to remove any PC board IFF set. To
j. Angular position of simulated antenna rotation
remove a card from either the receiver-transmitter or
is indicated by the POSITION DEGREES dials.
coder-decoder group case n the following procedures:
k. To enable various functions of the IFF set, set
(a) Remove power from the IFF set.
the appropriate ENABLE switch to ON.
(b) Remove the chassis from the IFF set and
3-9. Operation of Hybrid Attenuator 2A1
the retaining cover on the module.
The hybrid attenuator is provided to facilitate testing,
(c) Insert the tines of 1A1A2/2A3 into the holes at
troubleshooting, and alignment / adjustment of the
the top of the PC board and pull out the board.
receiver-transmitter of the IFF set. All of the specific
(2) Extender boards 1A1A3/1A1A4 and 2A4 provide
uses of the hybrid attenuator with the receiver-transmitter
maintenance accessibility to the PC boards used in the
are described in TM 11-5895-532-34-2. Operation of
IFF set. The extender boards are provided with test
the hybrid attenuator in typical receiver-transmitter test
points for each etched terminal PC board which allows
configurations is described below.
any input or output PC board to be checked. Extender
a. The test connections between the receiver-transmitter
boards 1A1A3/1A1A4 have pin connected jumper wires
and the hybrid attenuator, are typical for most of the
from the etched wiring to the output connector for
Consult the individual test procedure in TM 11-5895-532-
b. Adapters 2A2CP1 through 2A2CP6.
34-2 for possible deviations in the test connections and
Adapters 2A2CP1 through 2A2CP4 permit connection of
for prescribed settings of the ATTENUATOR control.
OSM-male to BNC-female connectors.
b. Cables 2W7 / 2W8 connect the RF sum (J2) and
2A2CP5 / 2A2CP6 permit connection of OSM-female
RF difference (J3), channels to the hybrid attenuator.
connectors. Typical connection of these components are
given in TM 11-5895-532-34-2.