Transmitter, Radio T-1054(P)/ GRC-144(V) Primary Power Distribution

TM 11-5820-695-35

other rf components between crystal mixer IA16-Z1 and

2-16.

Transmitter, Radio T-1054(P)/ GRC-144(V)

the input to Receiver, Radio I R-1467(P)/GRC-144(V).

Primary Power Distribution (fig. 2-5)

Variable attenuator 1A16AT1 provides 0

The 115 Vac primary power is applied to the

dB attenuation when the OUTPUT level control is set to

Transmitter, Radio T-1054(P)/GRC-144(V) through AC

the HIGH position. Consequently, the input to Receiver,

POWER INPUT connector 1A15A6J18. The 115 Vac

Radio R-1467(P)/GRC-144(V) is 30 dB above threshold

input passes through line filters 1A15A6FL1 and FL2 to

or approximately -61 dBm.

the POWER ON/OFF switch S3 on meter panel

assembly 1A15A8. When the POWER ON/OFF switch

To ensure that the output pcm pulses

is set to the ON position, 115 Vac passes through the 5

from the demodulator circuits in Receiver, Radio R-

AMPS SLOBLO power fuse 1A15A8F1 and is

1467(P)/GRC-144(V) are the same polarity as the input

distributed by terminal board 1A15TB3 to transformer

pcm pulses to the modulator circuits in Transmitter,

1A15A10T1, electrical frequency synthesizer 1A14 and

Radio T-1054(P)/GRC-144(V), the T-1054(P)/GRC-

blower motor 1A15B1. The 115 Vac lines are also

144(V) must be tuned 100 MHz higher or lower than the

distributed from 1A15TB3 to connector pins IA15J20-A

R-1467(P)/GRC-144(V) operating frequency as follows:

and C (320 FAULT LOCATOR-POWER SUPPLY

INTERCONNECT). Connector pins 1A15J20-A, B, and

(1) If the R-1467(P)/GRC-144(V) is tuned to

C are provided for future application of Radio Set

any frequency between 4400.0 and 4699.9 MHz, the T-

AN/GRC-144(V). Refer to the Transmitter, Radio T-

1054(P)/GRC-144(V) must be set in the same band

1054(P)/GRC-144(V) interconnecting diagram (fig. 5-15)

between 4400.0 and 4699.9 MHz. For example, if the

for point-to-point primary power connections. For the

receiver carrier frequency is 4685.2 MHz, the transmitter

AN/GRC-144(V)3 and 4 configurations, 115 Vac passes

carrier frequency must be set to 4585.2 MHz (but not

to fan 1A15B1 through thermostatic switch 1A15A17S1.

4785.2 MHz) in order to operate in the radio test set.

2-17.

Transmitter, Radio T-1054(P)/GRC-144(V) DC

(2) If the R-1467(P)/GRC-144(V) is tuned to

Power Distribution (fig. 5-16)

any frequency between 4700.0 and 5000.0 MHz, the T-

1054(P)/GRC-144(V) must be set in the same band

The 115 Vac input to transformer 1A15A10T1 is

between 4700.0 and 5000.0 MHz. For example, if the

stepped-down to an output voltages of 8.5, 11, 13.5, 15,

receiver carrier frequency is 4785.7 MHz, the transmitter

16, 16.5, 27.5, and 30 Vac. The ac output voltages are

carrier frequency must be set to 4885.7 MHz (but not

applied to voltage regulators in power supply 1A1. Four

4685.7 MHz) in order to operate the radio set.

5/6v voltage regulators, four 12v voltage regulators, and

three 15/28v voltage regulators are utilized. A typical

When the radio test set is not in use, 100

voltage regulator circuit is described in paragraph 2-18.

MHz radio frequency oscillator 1A2 must be turned off.

The voltage regulators provide regulated dc voltage

With the ON-OFF switch on 1A2 in the OFF position,

outputs and associated dc returns. The dc voltages and

the indicator on 1A2 is extinguished, the RADIO TEST

return lines are distributed to the plug-in assemblies and

SET indicator on the meter panel assembly 1A15A8 is

other cabinet components. Cabinet terminal board

lighted green, and the supply voltage is removed from

IA15TB3 and plate assembly terminal board 1A15TB1

the oscillator circuits in 1A2. For this condition, the test

are used to distributed certain voltages. Refer to the

signal to the R-1467(P)/GRC-144(V) is removed.

Transmitter, Radio T-1054(P)/-GRC-144(V)

Change 6

2-44