Section II. PRELIMINARY ADJUSTMENT OF EQUIPMENT

TM 11-5895-833-12/NAVELEX 0967-LP-550-1010/TO 31R5-2TSC54-91

Table3-10. Unit2, Cabinet

Interconnections and Test Points - Continued

Connector

(fig 3-9)

Function

A13J11

70-MHz input to up-converter 2A3J6 70 MHZ IF INPUT.

A13J12

70-MHz input to up-converter 2A2J6 70 MHZ IF INPUT.

A13J13

700-MHz input to up-converter 2A4J4-CP5 700-MHZ IF INPUT*

A13J14

700-MHz input to up-converter 2A3J4-CP5 700-MHZ IF INPUT'

A13J15

700-MHz input to up-converter 2A2J4-CP5 700-MHZ IF INPUT'

A13J16

5-MHz output to test translator 1A5J3 via time base patch panel 2A5J15.

A13J17

5-MHz from test translator standard 1A5J6 to time base patch panel A5J16.

A13J18

1-MHz spare outputs.

A13Jl9

1-MHz spare outputs.

A13J20

5-MHz spare outputs.

A13J21

5-MHz spare outputs.

*The 700-MHz input is a test input on the up-converter and an operational input on the up-converter (wide-band if.).

Section II. PRELIMINARY ADJUSTMENT OF EQUIPMENT

i. Set

each

frequency

synthesizer

METER

3-4. Preliminary Checks

FUNCTION switch to each position in turn and observe

a. Visually inspect all ground wires for defective

that the voltage meter indicates in the green area.

connections and strained conductors. Tighten any loose

connections.

NOTE

b. Check to see that all plug-in items are firmly seated

A frequency synthesizer requires a 1-hour

in their mating connectors.

warmup period to achieve maximum

c. Check to see that all cables are accurately attached

stability.

to their mating connectors and terminals.

j. Set test translator POWER

ON-OFF

circuit

breaker to ON. The POWER ON indicator lamp should

illuminate. Observe also that 725 MHz or 200 MHz

3-5. Preliminary Starting Procedure

indicator lamp illuminates.

a. Set down-converter (fig. 3-2) POWER ON-OFF

k. Set test translator LO SEL switch to 725 MHz and

circuit breakers to OFF.

observe that the 725 MHz indicator lamp illuminates.

b. Connect jumper cables on all frequency synthe-

l. Set test translator 70 MHz ON and 5 MHz ON

sizers (fig. 3-3, sheet 1) between REFERENCE FRE-

switches to on (up) position.

QUENCY SYNTH IN connector J2 and EXT STD OUT

m. Set test translator STATUS SELECT switch to each

connector J3.

position and observe the following indications on the

c. Set frequency synthesizer, test translator (fig. 3-4),

STATUS meter:

distribution amplifier (fig. 3-5), and up-converter (fig. 3-1)

Position

Indication

POWER ON-OFF toggle switches to OFF.

+ 24V

Blue scale

d. Apply power to cabinet blower assemblies (fig. 3-6).

725 MHz LO

Blue scale

NOTE

200 MHz LO

The BLOWER FAILURE indicator lamps on

725 MHz CONV INP

Blue scale

each cabinet blower assembly should illumi-

200 MHz CONV INP

Varies (ow)

nate and remain on for approximately 5

STD LVL

Blue scale

seconds. The indicator lamps should ex-

5 MHz INTL STD

Blue scale

tinguish when proper airflow is achieved.

70 MHz INTL STD

Blue scale

(must be 50 ohms terminated)

e. Set distribution amplifier POWER ON-OFF circuit

n. Set test translator LO SEL switch to 200 MHz;

breaker to ON. The POWER ON indicator lamp should

observe that the 725 MHz indicator lamp extinguishes

illuminate.

and the 200 MHz indicator lamp illuminates.

f interconnect the jacks on the time base patch panel

o. Set test translator STATUS SELECT switch to each

as shown in figure 3-8.

position and observe the following indications on the

g. Set distribution amplifier STATUS SELECT switch

STATUS meter.

to each position in turn, and observe that the STATUS

Position

Indication

INDICATOR meter reads in the blue scale.

+ 24V

Blue scale

h. Set each frequency synthesizer POWER ON-OFF

725 MHz LO

switch to ON. The POWER indicator lamp should

200 MHz LO

Blue scale

illuminate.

725 MHz CONV INP

Varies (high)

200 MHz CONV INP

Blue scale

3-14