Section II. DIRECT SUPPORT MAINTENANCE - TM-11-5820-401-35-10028

TM 11-5820-401-35-1/NAVELEX 0967-432-3020

resistors for transistors Q81 and Q82, respec-

Q81. The amplified output of transistor Q81 is

tively, Resistors R87, R98, and R90 are bias resis-

direct-coupled to the base of transistor Q82 which,

tors for transistors Q82 and Q83. Capacitor C85

in turn, applies the signal to the base of transistor

is a high audio frequency bypass capacitor.

Q83. Resistor R92 reduces the level of the signal

from transistor Q83. Capacitor C88 is a coupling

c. The microphone amplifier uses degenerative

capacitor.

ac and dc feedback to stabilize the operation of

b. The dc voltage for the A80 is fed from the

the transistors. Capacitors C84 and C86 and re-

sistors R85, R88, and R91 form the ac feedback

25.5-volt dc power supply through filter network

circuit. Resistor R88 is the principle component

consisting of resistor R93 and capacitor C87.

of the dc feedback circuit from the emitter of

Resistors R82 and R83 set the base voltage on

transistor Q83 to the emitter of transistor Q81.

transistor Q81. Resistors R84 and R86 are load

Section II.

DIRECT SUPPORT MAINTENANCE

(1) Multimeter TS-352B/U.

3-4. General

The C-2299/VRC is maintained at organizational

(2) Toolkit,

E l e c t r o n i c Equipment TK-

(TM 11-5820-401-12), direct support, and depot

100/G.

maintenance levels. Repair parts for the C-2299/

VRC are listed in appendix C.

b. Test Facilities. Either test facility in (1)

or (2) below may be used to check the perform-

3-5. Test Equipment and Test Facilities

ante of the C-2299/VRC.

Required

a. Test Equipment and Tools.

(1) Radio set facility.

Item

(2) Test box facility (figs. 2-4 and 2-5), To

paragraph 25 to fabricate the test box. In addi-

use the test box to test the C-2299/VRC, refer to

tion, the following dummy antenna items are

paragraph 2-4b (2 ) for the required items and to

required.

Item

to the radio sets ((1) below) or to the test box

3-6. Performance Check and Troubleshooting

((2) below).

C-2299/VRC

(1) Using radio sets (fig. 3-1). When the

Use the procedures in b or c below to troubleshoot

radio sets will be used to troubleshoot the C-

and check the performance of the C-2299/VRC.

2299/VRC, proceed as follows.

Set up the equipment as explained in a(1) or (2)

(a) Connect the C-2299/VRC to the radio

below.

sets as shown in figure 31. The required items

a. Test Setup. Connect the C-2299/VRC either

are listed in paragraph 35b (1).

3-6