Directed Electronics 554A Instruções de Operação descarregar pdf (Página 27)

TM 11-6625-2611-12

Table 3-1. Operator’s Controls, Indicators and Connectors (Continued)

Figure

3-1

index No.

Control, indicatar,

con nectar

AU X ATTEN control

LOW PWR IN jack

RF IN/OUT MAIN jack

RF IN/OUT DEMOD switch

RF IN/OUT AUX jack

SIG GEN FCTN switch

BIT (MOM) switch

CHAL AUX MOD DLY control

MODE 4 connector

AUX TRIG OUT

AUX TRIG ON/OFF switch

SUPPR OUT jack

Function

MODE 4 connector. Amplitude of ISLS pulse

relative to other challenge video is controlled by

AUX ATTN. Rf output is available at RF

IN/OUT MAIN jack only.

Used to control level of output rf at RF IN/OUT AUX jack or level of ISLS

pulse at RF IN/OUT MAIN jack when ISLS is selected. Control is calibr-

ated in dBm. Output level is variable from -10 to -90 dBm. Separate ISLS

scale for O to 9 dB relative to MAIN output level.

Used when testing signals with power levels less than +3 dBm. Also used

during self-test to connect either RF IN/OUT jack to test set receiver in-

put.

NOTE

Termination must be installed on LOW PWR IN jack when signal

under test is not being applied to low PWR IN jack for proper

receiver operation.

Used to connect test set to equipment under test. Rf output of equipment

under test is available for measurement by test set when RF IN/OUT

DEMOD switch is in MAIN position.

Used to select rf input applied to test set receiver. In MAIN position, rf sig-

nals from RF IN/OUT MAIN jack are applied to receiver and in AUX

position, rf signals from RF IN/OUT AUX jack are applied to receiver,

Used to connect test set to diversity transponder under test. The output of

equipment under test is available for measurement by the test set when

RF IN/OUT DEMOD switch is in AUX position. Not used for single chan-

nel transponder.

Three-position rotary switch used to determine mode of rf output. Used for

transmitter frequency and receiver bandwidth tests.

Switch position Function

SWP

MHZ

Selects ±5 MHZ rf sweep frequency operation.

Frequency markers are applied to MEASURE-

MENT MKRS OUT jack. Prf is 800 ±80 Hz.

FIXED FREQ

Selects fixed frequency operation. SIF reply

markers are applied to MEASUREMENT MKRS

OUT jack except when CHAL MODE SELECT

switch is in CW position.

SWP ±20 MHZ

Selects ±20 MHz rf sweep frequency operation.

Frequency markers are applied to MEASURE-

MENT MKRS OUT jack. Prf is 250 ±25 Hz.

Momentary pushbutton switch used to activate self-test circuits of test set.

When depressed, self-test oscillator is energized to check sweep rf opera-

tion and enables mode 4 replies.

Varies delay of challenge video applied to auxiliary rf channel 0.05 to 0.4

sec from the challenge video applied to main rf channel. Control has

detent at 0,2 ±0.05 µ sec. Delay is used to check diversity operation of

transponders.

Used, when test set is in Mode 4 mode of operation, to connect test set to

Test Set, Transponder Set AN/APM-239A.

Provides auxiliary trigger signal when AUX TRIG switch is at ON. The

auxiliary trigger signal is 20.0

3 volts in amplitude and 1

0.05

sec

wide when applied to a 93 ohm load.

Auxiliary trigger occurs 4 µ sec after oscilloscope trigger when SIG GEN

FCTN switch is in FIXED FREQ position and is coincident with

oscilloscope trigger when SIG GEN FCTN switch is in either SWP posi-

tion.

Toggle switch used to control auxiliary trigger signal. When in ON posi-

tion, applies auxiliary trigger to AUX TRIG OUT jack; when in OFF

position, auxiliary trigger is not applied to jack.

Provides suppression signal when SUPPR switch is at ON. Signal is 20.0

±2 volts in amplitude and 30 ±3

sec wide when terminated by a 2200

ohm load. Suppression pulse occurs 1

sec after pulse on MEASURE

MENT SCOPE TRIG OUT jack when SIG GEN FCTN switch is set to

FIXED FREQ.

3-7

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