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MODE-3 AND MODE-TEST EMERGENCY
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TM-11-4920-296-14-P Transponder Set Test Set AN/APM-378 (NSN 4920-00-134-1533) Manual
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Three subassemblies of the rf retie


TM 11-4920-296-14&P
the REPLY SAMPLE (DATA) must match, in
VIDEO. If the reply is correct, the KIR-lA
order to generate an SIG GO strobe (U1 -
feeds a TDV signal to the test set, where it
is applied to the second input of the U4 AND
TP4) and eventually therefore, to produce
circuit (whose other input is the coincidence-
the ACCEPT indication.
check pulse). With both inputs receiving cor-
2-43.  M O D E - 4 SELF-TEST. As for the
rect signals, the AND circuit then enables the
S I F self-test mode, the counted-down
evaluator U4 circuits to count the reply as a
CLOCK generates a DATA pulse (U3-TP1),
correct reply (in the same manner as it
w h i c h is loaded into the shift-register to
counts SIF GO pulses for SIF modes). Thus
initiate the To pulse. In Mode 4, this To
the U4 circuits will light an ACCEPT lamp if
pulse then initiates generation of a 2-pulse
t h e correct-reply rate exceeds the specified
M4 interrogation (U2-TP10), which is ap-
80, or 40 percent of interrogations (as deter-
plied to the rf module as transmitter modu-
mined by the type of transponder being tested).
l a t i o n (U2-TP8).  The last of these interro-
gation pulses is also sent to GTC ST (U3-
2-40.  SIF SELF-TEST MODE. For self-
TP8), and generates a GTC GO signal (U3-
t e s t operation, the FUNCTION switch is
TP9) which enables the 3-pulse decoder of
placed in the SELF TEST position, and the
U3 for approximately 78 microseconds.
MODE switch is placed in any of its posi-
t i o n s . In this operation, the counted-down
2-44.  I n this M4 self-test mode, the
CLOCK generates a DATA pulse (U3-TP1),
transmitted signal is coupled to the receiver
which is loaded into the shift-register as
c i r c u i t s , where it is processed and then
t h e To pulse (U2-TP4) and results in an
coupled to the digital circuits as the REPLY
SIF P1 pulse (U3-TP5) and a VIDEO GATE
SAMPLE (U3-TP10).  T h u s , the two pulses
( U 3 - T P 3 ) to activate the receiver circuits
r e c e i v e d are loaded into the shift-register.
video gating. Additionally, initiation of the
Together with the initial pulse that was gen-
To pulse causes a P1 interrogation pulse
erated, these pulses now appear as the To
(U2-TP8), which is applied to the rf module
p u l s e (U2-TP4), the l-microsecond tap
as the 1030-MHz transmitter modulation.
p u l s e (U2-TP2), and the 2-microsecond tap
p u l s e (U4-TP2).  T h e s e signals are now
2-41.  S i n c e the receiver circuits are gated-
applied to the 3-pulse decoder circuit of U3
on by the VIDEO GATE while the P1 pulse is
and are evaluated as if they were a normal
b e i n g transmitted, the transmitted P1 pulse
M o d e - 4 reply.
i s received, detected, and appears as a
R E P L Y SAMPLE pulse (U3-TP10) to the
2 - 4 5 . If the Interrogator Computer KIR-lA
d i g i t a l circuits.  T h i s REPLY SAMPLE
is not connected to the test set, a TDV sig-
pulse desynchronizes the CLOCK, and
nal is not required to produce the ACCEPT
appears as DATA (U3-TP1) to be loaded
i n d i c a t i o n ,  since the output of the 3-pulse
i n t o the shift-register stages. When loaded,
d e c o d e r triggers the ACCEPT circuit
this DATA becomes the Cl pulse following
through the normal evaluation path. If the
the F1 pulse that was previously generated.
KIR-lA equipment is connected, during M4
The F1 and Cl pulses are now shifted through
s e l f - t e s t mode, an M4 PRETRIGGER is
t h e register, and at the proper tap, an F2
s e n t to the KIR-lA from the test set. The
p u l s e is generated.  This F2 pulse is then
REPLY SAMPLE is then sent to the KIR-lA
sent to the rf module as a modulation pulse,
and if the reply is correct, the KIR-lA re-
and is then channeled back to the digital
t u r n s a TDV signal. This is the correct,
section as a REPLY SAMPLE (DATA) pulse
and required, ACCEPT condition for this
i n the same manner as was the Cl pulse.
mode of operation.
Once loaded into the register, the special
3 - p u l s e code (Fl, Cl, and F2) is shifted
2-46.  R F MODULE Al. The rf module Al
through the register as a normal SIF reply.
receives video-type signals from the digital
section of the test set, and produces pulsed
2-42.  For this special 3-pulse REPLY, the
rf outputs in response to those inputs. The
f r o n t panel CODE select switches are by-
rf output pulses from the rf module consti-
p a s s e d , and the parity-check circuits are
tute the actual interrogation pulses applied
preset to look for Fl, Cl, and F2. Therefore,


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