Voice [Usb] Operation

TM 11-5820-509-12

operation is desired.

3-9. Teletype [Fsk] Operation

3-7. Voice [Usb] Operation

When the radio set is operated in the fsk mode, a

Place the front panel controls as follows:

teletypewriter and a converter-oscillator (both not

a. Verify that CW-FSK/VOICE switch (fig. 3-1) is at

supplied) must be obtained. Converter-Oscillator CV-

VOICE.

786/PRC-47 (TM 11-5820-527-15) is recommended, or

b. For transmission/reception, connect Handset H-

any other converter that uses 2425-MHz (mark) and 1875-

33G/PT to either AUDIO connector on the receiver-

MHz (space) frequencies. For the fsk mode, make the

transmitter front panel. If only reception is desired,

following connections:

Dynamic Loudspeaker LS-166/U may be connected to the

a. Mount Adapter, Cable to Connector U-239/PRC-47

AUDIO connector.

(fig. 1-8) to either AUDIO connector on the receiver-

transmitter front panel (fig. 3-1).

CAUTION

b. Connect the output of the teletypewriter to the

During portable operation, use LO

converter-oscillator and the output of the converter-

power setting whenever possible to

oscillator to the wire connectors on Adapter U-239/PRC-

conserve battery power.

47.

c. Set XMTR PWR switch to LO for low power

c. Set the CW-FSK/VOICE switch (fig. 3-1) to CW-

operation, and to HI for high power operation.

FSK for both reception and transmission; set the switch to

d. Press push-to-talk button on handset and wait 1

VOICE for reception only.

second before start of message. Whenever reception is

CAUTION

desired, release push-to-talk button. Adjust VOLUME

control for comfortable listening level during receive

When battery is being used, use LO

periods.

power setting whenever possible to

e. If the transmitting frequency must be changed,

conserve power.

adjust the frequency control knobs as in paragraph 3-6c,

d. Set XMTR PWR switch to LO for low power

repeat a through d above, and then perform paragraph

operation, and to HI for high power operation.

3-11. If a 50-ohm antenna is used, proceed to paragraph

e. If the transmitting frequency must be changed,

3-12.

adjust the frequency control knobs as in paragraph 3-6c.

Repeat a through e above, and then perform paragraph

3-8. Telegraph [Cw] Operation

3-11. If a 50-ohm antenna is used, proceed to paragraph

Adjust the front panel controls as follows:

3-12.

a. Set the CW-FSK/VOICE switch (fig. 3-1) to CW-

3-10. Remote Control Operation

FSK for both reception and transmission; set the switch to

VOICE for reception only.

For remote control operation, proceed as follows:

b. Connect Cable Assembly, Special Purpose, Electrical

a. Connect Control Group AN/GRA-6 (TM 11-5038)

Branched CX-8396/PRC-47 to either AUDIO connector

to either AUDIO connector (fig. 3-11 on the receiver-

on receiver-transmitter front panel.

transmitter front panel.

c. Insert the connectors of Headset H-233/PRC-47 and

b. Set all operating controls on the front panel in

Telegraph Key J-45 into the mating connectors in the

accordance with preceding instructions for mode of

branched end of Cable CX-8396/PRC-47.

operation desired. The AN/GRA-6 is then used to control

CAUTION During portable operation, use LO power

the power function only.

setting whenever possible to conserve battery power.

3-11. Tuning Power Amplifier

d. Set XMTR PWR switch to LO for low power

When the transmitter portion of the receiver- is to be used,

operation, and to HI for high power operation.

the power amplifier and the antenna system must be

e. Adjust VOLUME control for a comfortable listening

resonated to the operating frequency to assure maximum

level during receive periods.

radiation of the rf signal and to prevent damage to the

f. If the transmitting frequency must be changed, adjust

power amplifier output circuits.

the frequency control knobs as in paragraph 3-6 c, repeat

CAUTION

a through e above, and then perform paragraph 3-11. If a

When the transmitting procedures direct the operator to

50-ohm antenna is used, proceed to paragraph 3-12.

this paragraph, be sure to perform each of the following

procedures in the sequence listed to assure proper loading.

a. Set XMTR PWR switch (fig. 3-1) to OFF.

3-4