Overall Block Diagram Description of Transmitter, Radio T-1054(P)A/GRC-144(V)

TM 11-5820-695-35

are lighted green. If an output data traffic failure is

circuits consist of a meter selector switch and a meter.

A signal is monitored by setting the meter selector

detected by the cable-to-radio circuits in 1A12, the

CNTRL ALARM and the external traffic in indicators

switch to the appropriate position. Meter calibration

light red. The CABLE TO RADIO MODEM indicator

resistors are provided for certain meter indications. The

lights red only when a functional failure exists in 1A12

metering circuit also provides a test position which

and actual data traffic is present. If data traffic is not

allows component test lead monitoring.

present, this alarm is inhibited (remains green) even if a

functional failure exists. The orderwire input is either

Power Supply Circuits. Power supply 1A1

two digital orderwire signals (DOW and DVOW) or one

produces regulated +28 vdc, +15 vdc, +12 vdc, -12 vdc,

analog orderwire signal (AVOW). When operating in the

-6 vdc and +5 vdc voltages required to operate the

analog orderwire mode, the AVOW is routed to

circuits and indicators in Transmitter, Radio T-

orderwire assembly 1A13 where it is processed as

1054(P)/GRC-144(V).

described in (2) below. When operating in the digital

orderwire mode, digital orderwire signals are processed

2-3.1.

Overall Block Diagram Description of

only in digital data combiner 1A12; orderwire assembly

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

1A13 processes analog orderwire signals but not digital

(fig. 5-6.1)

orderwire. The data signal is scrambled, retimed and

regenerated, and the digital orderwire (DOW and

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

DVOW) signals are retimed and multiplexed into a

the 4.4 to 5.0 GHz frequency range with a continuous

single bitstream (CVDOW) in digital data combiner

wave (cw) power output of 250 milliwatts nominal.

1A12. The data and CVDOW (multiplexed DOW and

Figure 5-6 illustrates the major signal flow (heavy lines

DVOW) signals are then combined in a linear summing

on the diagram) and the control and alarm signals

amplifier and applied to the radio modulator circuits

between assemblies in the T-1054(P)A/GRC-144(V).

through attenuator 1A3 and af-rf amplifier 1A4. When

The processing of signals within complex assemblies

operating in the analog orderwire mode, this signal is the

such as digital data combiner 1A12, orderwire assembly

data signal only; the analog orderwire signal (AVOW)

1A13, and electrical frequency synthesizer 1A14 are

comes from orderwire assembly 1A13.

explained in subsequent paragraphs.

(2) The thru ow rec signal is amplified

Transmit Path. The transmit (cable-to-

in orderwire assembly 1A13 and distributed to Handset

radio) signal path through the T-1054(P)A/GRC-144(V)

H-156/U, Telephone Set TA-312/PT, attenuator

is shown with the FROM CABLE signal entering the T-

assembly 1A3 (to radio ow), and to the loudspeaker on

1054(P)A/GRC-144(V) on the left and the RF OUTPUT

1A15A8. The loudspeaker level is controlled by the

signal leaving on the right-hand side of figure 5-6.

SPEAKER VOLUME control. The RING pushbutton on

1A15A8 provides in-band tone signaling to locally

(1) The FROM CABLE input (data

initiate ow communications. The RING indicator on

signal from the DGM and orderwire signal from the OCU

1A15A8 lights amber when the RING pushbutton is

and CLED) is applied to the cable-to-radio circuits of

depressed or when a ring signal is received from a

digital data combiner 1A12. The CABLE TO RADIO

remote ow station. The CNTRL alarm indicator on

MODEM indicator on meter panel assembly 1A15A8

meter panel assembly 1A15A8 is controlled by alarm

and a remote traffic in indicator are controlled by the

circuits in 1A13. Normally, the CNTRL ALARM indicator

cable-to-radio circuits in 1A12 through the radio patch

is lighted green. If an

panel. For normal input data traffic conditions, the

CABLE TO RADIO MODEM and the traffic in indicators

Change 6 2-6.1