INITIAL CONTROL SETTINGS AND START-UP PROCEDURES (cont)

TM 11-5820-918-13

d. Set the .1 PWR/FULL PWR switch to the desired power level. When in DIRECT

operation, transmitter output power is nominally 10 watts with the switch in .1 PWR

position; the output is nominally 100 watts with the switch in the FULL PWR position.

In the DIPLEX operation the output power is nominally 0.2 watts in the .1 PWR position

or 2.0 watts with the switch in the FULL PWR position. Normally for start up opera-

tion, the transmitter is operated in DIRECT, FULL PWR until synchronization is ob-

tained with the receiver. The higher output power in this configuration makes the

synchronizatoin procedure easier for the RCS-4B operator. Once proper synchron-

ization is achieved, the transmitter power level and diplexer configuration may be

changed to meet operational requirements.

Set UPPER FREQ switch to either 16 or 30 to agree with receiver.

Press front panel POWER pushbutton switches of 1024 and 4011 ON.

Turn off (down position) all PROGRAMMER MINUTES switches on 1024.

h. Place MODE switch in MAN position; then press RESET switch to set frequency

sweep at the lower limit of 02.00 on the MHz frequency display.

i. Place MODE switch in SET position; then press RESET, then START, and

RESET again to set system time at 00:00 on the MIN /SEC clock display.

j. If frequency blanker is not to be used, set BLKR PROG/RUN switch to PROG.

If blanker is to be used, perform the following steps to set up the desired blanking

frequencies in memory.

(1) Place BAT switch to ON position.

(2) Set BLKR PROG/RUN switch to PROG.

(3) Set the CHANNEL thumbwheel switch to 0 position. Sixteen storage channels

"0" to "15" are available for establishing sixteen discrete blanking frequencies. If

only a few blanking frequencies are to be used, any of the storage channels may be

selected without regard to sequence.

(4) Set BLANKER FREQ thumbwheel switches to the desired center frequency.

The set frequency represents the center of a 60 kHz band during which the trans-

mitter output will be disabled.

NOTE

For transmitters prior to serial number 400100, the blanking band is 20

kHz wide (not 60 kHz).

(5) Prss BLKR STORE switch to enter the set BLANKER FREQ in memory.

(6) The stored frequency should be checked by pressing the BLKR DSPL (dis-

play) switch and observing the readout on the MHz frequency display.

(7) Advance CHANNEL thumbwheel switch to next available position.

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