NORMAL OPERATION - TM-11-5820-917-130047

TM 11-5820-917-13

Press CURSOR ERASE and "

" switches simultaneously until CRT screen

is cleared of cursors. If cursor(s) persist, cycle power off-on, and repeat steps 1

thru 5.

f. Adjust CRT BRIGHT control (screwdriver adjustment) as desired. Do not

overdrive brightness adjustment to point where the white raster is visible as this

may damage the CRT.

Perform a receiver self test. Turn MODE switch to MAN and press START

switch. The BATT switch should be placed in ON position prior to initiating the test.

Press the TEST switch and hold it depressed for an entire sweep. After not more than

five seconds after pressing TEST, the following results should be observed:

(1) The green BATT lamp lights. For a complete description of the battery

test as applicable to either the rechargeable or non-rechargeable supply, refer to

(2) A fixed tone (1050 Hz) is heard on the speaker. Check that the AUDIO

GAIN control is adjusted properly.

(3) The green RCVR lamp lights.

If the red RCVR lamp lights, refer to

paragraph 5-9 for troubleshooting procedures.

(4) A horizontal line is displayed approximately in the middle of the CRT, or

approximately 3/4 inch (2 cm) below the bottom of the AGC bargraph. The AGC

bargraph should indicate a signal amplitude of approximately 30% of the receiver

AGC range or about 4 mm above the AGC baseline.

Allow a twenty-minute warm-up period for the frequency standard to stabilize.

i. Synchronize the receiver to the transmitters by performing the procedures of

paragraphs 3-11 thru 3-19, after which the RCS-4B is ready for normal operation.

3-9. NORMAL OPERATION. After synchronization is achieved with the transmitters

and PATH PROGRAMMER times selected, the receiver can be operated using only

the DISPLAY and CURSOR controls. Since specific procedures are dependent on

particular field conditions and frequency management requirements, only some typical

applications of operating controls are provided as examples. Refer to Section 7

for a discussion of HF circuit management procedures.

a. In the programmer mode of operation, the PATH PROGRAMMER MINUTES

switches select the path to be received for any five minute period. The PATH digit

display reads out the path being received and the instantaneous receiver frequency.

The PATH 1 clock time is also displayed whenever the MODE switch is in PROG

position. If the MODE switch is placed in a SET position (either SET 1, SET 2, or

SET 3), the time readout on the MIN SEC display is for the corresponding path 1, 2,

or 3. If the MODE switch is in SET 2 or SET 3 position, and the DISPLAY TIME PATH

1 pushbutton is pressed, the LED display shows path 1 time as long as the push-

button is held down. However, all other controls, such as START, RESET, AUTO

SYNC, and SLIP RATE will operate on the circuits of the selected path. Whenever

the MODE switch is in any of the three set positions the PATH digit on the LED

3-9