LIST OF ILLUSTRATIONS Continued

TM 11-5820-803-12

LIST OF ILLUSTRATIONS Continued

Figure

Title

Page

PSK modem theoretical bit error rate performance for various coding configurations (best

case performance) ..............................................................................................................................

2-5

Eb/No = C/KT - 10 log Rp..........................................................................................................................

2-6

Differential encoding and decoding waveshapes ...................................................................................

2-7

Coder/decoder signal paths ...................................................................................................................

2-9

2-8

External coder/decoder interface phasing ..............................................................................................

2-10

2-9

Digital user interface ..............................................................................................................................

2-11

2-10

Required standard data and clock input characteristics (normal polarity) ..............................................

2-12

2-11

Open circuit standard data and clock output characteristics (normal polarity) ........................................

2-12

ICF/PSK modem configuration via li ne of-sight (LOS) microwave terminal ............................................

2-13

ICF/PSK modem configuration via shielded RF cable ...........................................................................

2-13

2-14

Attenuation characteristics of RG-217/U cable ......................................................................................

2-15

E/N, as a function of signal/noise meter reading ...................................................................................

2-16

Bit error rate versus signal/noise mer reading for differentially encoded signals using various

error coding modes . ...........................................................................................................................

2-17

Two PSK modems used in ground relay applications .............................................................................

2-18

PSK modem overall dimension ...............................................................................................................

2-19

Special installation accessories .............................................................................................................

2-20

PSK modem, rear view ...........................................................................................................................

2-21

70 MHz input signal range selection switch S1 (viewed from component side of input filter

card, SM-D-73113, A2A1A1A22) .......................................................................................................

2-24

2-22

Standard clock input inverter switch S1 (viewed from top of input interface card, SM-D-742037,

A2A2A2A24) ...........................................................................................................................................

2-24

2-23

Line driver polarity inverter switches S1 and S2 (viewed from top of line driver card,

SM-D-742053, -A2A2A1A21-, A2A2A1A22, A2A2A1A23 ...................................................................

2-24

External coder interface clock inverter switches S1 through 56 (viewed f rom top of coder

interface card, SM-A-742049, A2A2A2A5 ...........................................................................................

2-24

2-25

LOS/cable driver output level selection switch S1 (viewed from top of LOS/cable driver card,

SM 742081 A2A2A2A3........................................................................................................................

2-25

2-26

LOS/cable receiver and decoder selection switch S1 through S4 (viewed from component

side of LOS/cable receiver and decoder card, SM-742089, A2A2A2A1 ............................................

2-25

2-27

LOS/cable receiver and decoder adjustments ........................................................................................

2-26

2-28

Equalization waveforms ..........................................................................................................................

2-28

3-1

PSK modem, operator controls ..............................................................................................................

3-1

4-1

Bit error rate measurement, test setup ..................................................................................................

4-3

5-1

Typical PC card pin locations ..................................................................................................................

5-3

5-2

Thumbwheel switch assembly terminal boards ......................................................................................

5-4

5-3

Power supply removal and installation ...................................................................................................

5-5

LIST OF TABLES

Table

Title

Page

2-1

Selection of internal transmitter filters .....................................................................................................

2-3

2-2

PSK modem interconnections .................................................................................................................

2-21

2-3

Site interface (J5) signal list ....................................................................................................................

2-22

2-4

Coder interface (J6) signal list ...............................................................................................................

2-23

2-6

Direct digital output interface polarity selection .....................................................................................

2-27

2-6

External coder/decoder interface clock polarity selection .......................................................................

2-27

2-7

LOS/cable receiver and decoder witch settings .....................................................................................

2-27

2-8

Operation of LOS/cable receiver and decoder selection switches .........................................................

2-28

3-1

Operator controls, indicators, and connectors .......................................................................................

3-2

Operational switch settings .....................................................................................................................

3-5

3-3

Self-test initial switch settings .................................................................................................................

3-6

3-4

Self-test procedure . ................................................................................................................................

3-6

3-5

Coder/decoder test procedure ................................................................................................................

3-6

4-1

Preventive maintenance cheeks and services ........................................................................................

4-1

4-2

(Deleted)

4-3

Operational checks .................................................................................................................................

4-2

4-4

BER test control settings .........................................................................................................................

4-3

5-1

Preventive maintenance check s and services ........................................................................................

5-1

5-2

Troubleshooting ......................................................................................................................................

5-2

5-3

Power supply measurements ..................................................................................................................

5-3

5-4

Thumbwheel switch, truth tables .............................................................................................................

5-4

Change 2 iii