7404A-1 - Control Monitor Test Set (Oscar)
Allows monitoring or injection of CCCS bus signals

CCCS = Communication Computation Control System

  • Clock = Continuous sine-wave at 4800Hz
  • Control = Computer talking to equipment
  • Logic Level High = in-phase with Clock
  • Logic Level Low = out-of-phase with Clock
  • Monitor = Equipment talking back to computer

Back of Unit:

  • S1 UP, in Sine Wave at all times
  • S2, In LCU for use as local control, in DCU/DCFR for simulating equipment
  • P2, P3, P4 Not used
  • P5, DCU/DCFE
  • P6, LCU Sine Wave / use in conjunction with S2
  • F1, Fuse

Front of Unit:

  • Clear button - NEVER USED
  • Send button - Sends control word ONCE
  • 32 toggle switches
  • Dialogic bit must be 1 all the time
  • S3, Parity Encode, leave in Auto (UP)
  • S4, Parity Mode, sensed (UP)
  • S5, Retransmit (3-position), Use in Continuous (UP)
  • S6, Address length, 7-bit for Local Control, 5-bit for DCU/DCFE
  • S7, Half Duplex (HDX) / Full Duplex (FDX), Leave in Full Duplex (FDX)

CONTROL Words come into Oscar and are displayed on the white lights

Receiver:

Word 1

Frequency

Controls frequency

Word 2

Mode

Controls power, sidebands

Word 3

Squelch

Controls receiver squelch

Word 4

Monitor Request

Asks for Receiver Status

Exciter:

Word 1

Frequency

Controls frequency

Word 2

Mode

Controls power, sidebands

Word 3

Carrier Level

Controls level of Carrier injected to Radio

Word 4

Monitor Request

Asks for Exciter Status

PA:

Word 1

Frequency

Reflect dialed-in frequency above 99KHz, i.e. starting at .1MHz to 29.9MHz

Word 2

Mode

Power on/off, Key, Tune

Word 3

A/D Converter

Word 4

Monitor Request

Asks for PA Status

Coupler:

Word 1

Frequency

100KHz to 20 MHz

Word 2

Mode

Exciter Tune, Key

Word 3

NONE

Word 4

Monitor Request

Asks for Coupler Status

SB-3390 Maintenance Display:

Word 1

Monitor Data

Control to display data of selected DCU

Word 2

Control Link Monitor

Control to display DCU not on

Word 3

Multimeter Display

Control to display selected PA V/Amps

Word 4

N/A

NEVER USED

Logic Level 1 on the CCCS bus indicates a Status Change
BASICS:

Bit 0

Dialogic Bit

1 = Control, 0 = Monitor

Bits 1 & 2

Radio Group Address

01 for ALL TSC-60 Shelters

Bits 3-5

DCU Address

001 RX, 010 TX, etc.

Bits 6-7

Control word sub-address

00 = Word 1, 01 = Word 2

Bit 8

Parity

Bits 9-31

Data Field

Instructions to turn on/off, enable sidebands,

change frequency, etc.

Examples (first bit is count of zero, last bit is 31):

Exciter Keyed in self-test (a1?)

1|01|010|01|0|0000|0100|1000|0000|0000|101

SB-3390 asking OK-145 for Exciter Status

1|01|111|01|1|0000|0000|0010|0000|0000|000


Created by PA4RM