PRIMARY POWER STRAPPING.

TO 31R2-2GRC171-2

TM 11-5820-815-14

NAVELEX 0967-LP-544-5010

Figure 2-2. Primary Power Strapping

2-26.

PRIMARY POWER STRAPPING.

keying options are determined by strapping on the keyer

a. Extend RT-980/GRC-171 on the rack slides and

module and are shown in figure 2-4. To verify or change

remove the top cover.

the strapping, proceed as follows:

b. Check to ensure that the strapping on A10TB1

a. Remove keyer module A9. (Refer to removal/'

matches the station primary power supply. Change if

replacement procedures in chapter 5, section I, of this

necessary. Refer to figure 2-2.

manual.)

2-27.

AUDIO MODULE A4 STRAPPING.

b. Verify that strapping matches station require-

ments. Refer to figure 2-4. Change if necessary.

2-28. The audio module A4 has strapping options for

audio input level and transmitter keying. Audio input

c. Replace keyer module.

level strapping provides for normal level (-15 to +10 dB

mW) and -35 dB mW (-35 to -15 dB mW) audio inputs.

2-31.

NOISE BLANKER (P/O RECEIVER RF

The transmitter is normally keyed by applying a ground

MODULE A3).

or dc voltage to the center tap of the audio input line

transformer (A10A2J22-D/E) as determined by the

2-32. The noise blanker provides muting of the

strapping on audio module A4. The strapping options for

receiver from impulse noise received at the antenna.

audio input level and transmitter keying are listed in

The noise blanker has two strapping options. The

figure 2-3. To verify or change strapping option, proceed

strapping options are listed in figure 2-5. To verify or

as follows:

change the strapping, proceed as follows:

a. Remove audio module A4. (Refer to removal/

a. Remove receiver rf module A3 (refer to removal/

replacement procedures in chapter 5, section I, of this

manual.)

manual).

b. Verify that strapping matches station require-

ments. Refer to figure 2-3. Change if necessary.

ments. Refer to figure 2-5. Change if necessary.

c. Replace audio module A4.

c. Replace receiver rf module A3.

2-29.

KEYER MODULE A9

2-33.

INITIAL CHECKOUT PROCEDURE.

2-30. The keyer module provides a tone/VOX keying

2-34. Upon completion of the installation and initial

option, current keying option, and four voltage keying

setup procedures, check to ensure that the equipment is

options. Tone/VOX keying option and the four voltage

operating properly by performing the operating

instructions in chapter 3, section II, of this manual.

2-7