Test Fixture for Signal Data Translator CV-1377A/PRC-47

TM 11-5820-509-35

Symbol

Description

Mfgr Part No.

Mfgr Code

Resistor, fixed, 10,000 ohms, 10%, 1/2 W (FSN 5905-185-8518)

RC20GF103K

Resistor, fixed, 3300 ohms, 10%, 1/2 W (FSN 5905-195-6502)

RC20GF332K

Crystal Unit, Quartz, 500.000 kHz (FSN 5955-892-3210)

CR46AU500-00KC

XY1

Socket (FSN 5935-201 7119)

TS0205CO1

Note. All manufacturer's codes are 5-digit numbers. The corresponding manufacturer's name and address are listed in SB 708-42 Catalog Handbook (H4-2).

6-19. Test Fixture for Signal Data Translator

(6) POWER 26.5 VDC 1 AMP fuse. This

CV-1377A/PRC-47

protective device is connected in the +26.5 volts

primary power circuit to protect it from overload.

(fig. 7-17)

(7) AVC ON-OFF switch. This toggle switch

selects a variable negative bias for the avc circuits when

a. The test fixture for Signal Data Translator CV-

placed in the ON position.

1377A/PRC-47 contains all switches, jacks, and lamps

(8) FUNCTION SEL RCVR-XMIT switch.

necessary to electrically test and adjust the module

This toggle switch selects the receive or transmit mode

without providing a complete AN/PRC-47 Radio Set.

for the module under test.

Indexing fixture (fig. 6-7) is attached to the coupling end

of the module to permit accurate indexing of the

(9) ERROR B ADJ control.

This

bandswitch and the slug rack during maintenance

potentiometer controls the level of external error voltage

procedures. Power for the test fixture and the module

under test is provided externally and is connected to the

(10) ERROR A ADJ control.

This

test fixture by a specially fabricated cable attached to

potentiometer controls the level of external error voltage

power connector J5 at the rear of the test fixture.

b. The operating controls on the front panel of the

(11) LOOP SEL OPEN-CLOSED switch. This

test fixture (fig. 6-6) perform the following functions:

toggle switch selects external error voltages A and B in

(1) POWER ON -OFF switch. This toggle

the OPEN position to permit calibration of the CV-

switch controls the 115 volts, 400 Hz ac, the +19.5 volts

1377A/PRC-47 master Oscillator.

In the CLOSED

dc, and the +26.5 volts dc input voltages to the test

position, the error voltages generated by the C-

fixture and the module under test.

4311/PRC-47 are applied to the master oscillator.

(2) POWER lamp. This indicator is lit when

(12) OSC CONTROL S1 switch. This rotary

power is connected to the 115 volts, 400 Hz primary

switch selects the proper crystal for operation with

power circuit and the POWER ON-OFF switch is in the

oscillator Q20.

ON position.

(13) OSC CONTROL S2 switch. This rotary

(3) POWER 115 VAC 1/4 AMP fuse. This

switch selects the proper crystal for operation with

protective device is connected to the 115 volts, 400 Hz

oscillator Q21.

primary power circuit to protect it from overload.

(14) Test jacks and binding posts are provided

(4) POWER 19 VDC 1/2 AMP fuse. This

for the attachment of signal leads and test equipment

protective device is connected to the +19.5 volts dc

and are self-explanatory.

primary power circuit to protect it from overload.

c. The piece parts required for fabrication of the

(5) POWER 6.3 VAC 1 AM P fuse. This

test fixture are listed in the following chart and

protective device is connected to the secondary winding

suggested parts placement is shown in figures 6-21

of transformer T1 and protects this 6.3 volts winding

through 6-23 inclusive. Schematic diagram {fig. 7-17)

from overload.

illustrates the internal circuit of the test fixture.

6-45