Directed Electronics 554A Instrukcje Operacyjne Pobierz pdf (Strona 8)

TM 11-6625-2611-12

use position. Normally, the ground pin is connected to

power ground. However, if the ground system of the

transponder under test is other than the power ground,

the ground pin is pivoted to the not-in-use position

when the plug is inserted into the power receptacle.

The overall length and weight of power cable assembly

are listed in paragraph 1-12.

d. Adapters. Two Adapters UG-565A/U are pro-

vided as a means of mating the rf cable assembly to

transponders with female type C rf connectors, such as

UG-571/U. The overall dimensions and weight of

Adapter UG-565A/U are listed in paragraph 1-12.

e. Rf Cable Assembly, 12 Inch (50.48CM). The rf ca-

ble assembly is used to connect the test set RF IN/OUT

jacks to the LOW PWR IN jack during self-checks. The

type of cable used is RG-223/U. One end of the rf cable

assembly has a male type BNC (UG-88/U) connector.

This end of rf cable assembly mates with the test set

LOW PWR IN jack. The other end of the rf cable as-

sembly has a male type N connector which mates with

either test set RF IN/OUT jack. The overall length and

weight of rf cable assembly are listed in paragraph

1-12.

f. Video Cable Assemblies, 60 Inch (152.4 CM).

Four video cable assemblies are provided to intercon-

nect the test set to the oscilloscope. Video cable assem-

blies are constructed of RG-62A/U cable. Each end of

the cable assemblies has a male type BNC (UG-88/U)

connector. The overall length and weight of the video

cable assemblies are listed in paragraph 1-12.

g. Rf Cable Assemblies, 96.0 Inch (243.84 CM). Two

rf cable assemblies are provided to interconnect the

test set RF IN/OUT jacks to the transponder rf jacks.

Each cable is made of a calibrated length of RG-212/U.

The attenuation of the rf cable assembly is marked on

the cable (usually 0.9 db) for either 1030 MHz or 1090

MHz which must be added to the test set attenuator

setting when determining the output signal of the test

set. The attenuation must also be considered when

measuring the rf output power of the transponder set

under test. Each end of rf cable assembly has a male

type N connector for mating with a female type N con-

nector such as UG-19B/U. The overall length and

weight of the rf cable assembly are listed in paragraph

1-12.

h. 15 and 30 Db Attenuators. The attenuators are

used to extend the input power capability of the test set

LOW PWR IN jack to a range between +3 dbm and

+48 dbm. Each attenuator is individually calibrated

with the actual attenuation marked on the side. One

end of the attenuator has a male type BNC connector

which mates with the test set LOW PWR IN jack. The

other end of the attenuator has a female type BNC con-

nector which mates with a UG-88/U connector at-

tached to an rf cable. The overall dimensions and

weight of the attenuators are listed in paragraph 1-12.

1-4

L Conversion Chart The conversion chart is used to

convert test set power meter indications in dbw into

power inputs in KW. Meter indications are read on the

bottom of the chart and power is read along the side.

The dimensions of the calibration chart are listed in

paragraph 1-12.

j. Video Terminations. Three feedthrough-type ter-

minations are provided, each with a connector on one

end to mate with a UG-912/U and a connector on the

other end to mate with a UG-260/U. The dc resistance

of two of the terminations is 75 ohms and the remain-

ing termination is 93 ohms. The 75-ohm terminations

(MX-554 A/U) provide proper termination of demodu-

lated and reply marker test set outputs. The 93-ohm

termination (MX-554 A/U) provides proper termina-

tion of mode 4 reply output.

1-10. Tabulated Data

Parameter

Internal PRF:

Reduced PRF:

RF Sweep PRF:

Scope Trigger Output

Auxiliary Trigger Output:

Codes:

Challenge Pulse Spacing

Mode 4 Pulse Spacing (2nd 3rd,

and 4th sync pulses):

Challenge Pulse Width:

ILSL Pulse Spacing

Suppression Pulse Output:

Mode 4 Enable Trigger Input

Mode 4 Challenge Video Input

Mode 4 Reply Output:

Mode 4 Disparity Output:

SIF Markers:

Timing Markers

Description

10 to 10,000 pps for SIF

5 to 5,500 pps

250 Hz and 800 Hz, ±10 percent

5±1V, positive, 3 ±2 µ sec,100

ohms, 0.5 to 4000 µ sec varia-

ble delay

20 ± 3V, positive, 1 ± 0.5 µ see,

90 ohms

1, 2, 3/A, C, Test, Mode 4 words

A and B

Nominal, ±0.2, ±0.9 µ sec

(±0.05 µ sec) and Variable

±1µsec

Nominal, ±0.2, ±0.9 µsec

(±0.05 µ see) and Variable

±1 µsec

0.25, 0.5, 0.8, 1.7 µ sec (±0.05

µ sec) and Variable from 0.25

to 1.7 µ sec

Nominal, ±0.15, ±0.6 µ sec

(±0.05 µ see) and Variable

±1µsec

20 ± 2 V, positive, 30 ±3 µ sec,

2200 ohms, <50 picofarad

1.5 to 5 V, positive, 0.5 to 3 µ sec,

90 ohms

1.5 to 5V, positive, 0.4 to 0.6

µ see, 90 ohms

5 ±0.5V, positive, 0.5 ±0.1

µ sec, 3 pulses spaced 1.8

±0.1 µ sec, 90 ohms, 200 µ sec

after fourth sync pulse

5 ±0.5V, positive, 0.5 ±0.1

µ sec, 90 ohms, 65 ±1 µ sec

after enable trigger or coinci-

dent with the pulse at 66 µ sec

for Mode 4 (word A and B)

Disparity

0, 20.30, 24.65 and 49.30 µ sec

(±0.02 µ sec), Variable from 2

to 4 µ sec after P3; > .5V posi-

tive, 0.15 ±0.05 µ sec, 75

ohms

0.1, 1.0, and 10.0 µ sec ±.02%,

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 58 59

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