INITIAL CONTROL SETTINGS AND START-UP PROCEDURES (cont)

TM 11-5820-918-13

(8) Repeat steps 4 through 7 to store up to 16 blanking frequencies. If fewer

than 16 blanking frequencies are to be stored, program the unused channels to 00.00

MHz.

NOTE

In turning the transmitter power off and then on with the standby power

supply off, the blanker frequency memory will store some random numbers.

Therefore, it is always necessary to check all channels for the proper

setting prior to operation following shutdown.

(9) Place BLKR PROG/RUN switch in RUN position.

k. Allow twenty-minute warm-up for the transmitter frequency standard to stablize.

l. The path programmer MINUTES switches should be set in coordination with the

operator of the RCS-4B receiver. The RCS-4B may be operated with up to three dif-

ferent transmitters, but only one at a time. Thus, the MINUTES switches are pro-

vided to establish the times that a particular transmitter will be received. For ex-

ample, transmitter 1 may be set to 00, 15, 30 and 45. Transmitter 2 set at 05, 20,

35 and 50 and transmitter 3 set at 10, 25, 40 and 55.

m. In coordination with the operator of the RCS-4B Receiver, synchronize the start

of system time. The MODE switch should be in SET position and the START switch

pressed at the desired second for sweep start. See the technical manual for the RCS-

4B (T.O. 31R2-4-470-1) for further details on synchronization.

The ADV TIMER button can be used to set the transmitter quickly to real time

(as determined from W WV or similar source). It may also be used to start the trans-

mitter with a timing offset. This is done so that individual transmitters can be dis-

tinguished from each other. Follow these steps to begin a sweep with a timing offset:

(1) Determine how much time the start of the sweep is to be offset. For ex-

ample, the offset is to be 2 minutes and 20 seconds.

(2) Establish the accurate real time by tuning to a time standard (WWV) or using

digital watches to note the minutes and second.

(3) Carefully note when the watch or standard reaches 00 seconds of a minute.

Note the minute (for example, 16 minutes past the hour).

(4) Count 20 seconds (for this example) on the watch. When it reaches 20

seconds press the START button. The timer display will now start on the 1024.

(5) Press the ADV TIMER button to set the minute counter on the display to

the real time (from digital watch or WWV) minus two minutes (for this example).

Thus, if it was 16 minutes passed the hour, the ADV TIMER button must be pressed

to read 14 minutes on the display.

(6) The transmitter is now offset 2 minutes and 20 seconds after real time. This

can be checked by comparing the display with WWV or the digital watch when the dis-

play reaches a minute mark.

3-4