Frequency Control Circuits-continued

TM 11-5820-509-35

KILOCYCLES

Mixer CR1

KILOCYCLE

Mixer CR1 1

KILOCYCLES

Mixer CR10

KILOCYCLES

Mixer CR10

indicator

output

indicator

output

reading

(MHz.)

reading

(MHz.)

indicator

output

indicator

output

reading

(MHz.)

reading

(MHz ).

9000 to 9099

10.2

10500 to 10599

11.7

9100 to 9199

10.3

10600 to 10699

11.8

XXX66

634

XXX83

617

9200 to 9299

10.4

10700 to 10799

11.9

XXX67

633

XXX84

616

9300 to 9399

10.5

10800 to 10899

12.0

XXX68

632

XXX85

615

9400 to 9499

10.6

10900 to 10999

12.1

XXX69

631

XXX86

614

9600 to 9599

10.7

11000 to 11099

12.2

XXX70

630

XXX87

613

9600 to 9699

10.8

11100 to 11199

12.3

XXX71

629

XXX88

612

9700 to 9799

10.9

11200 to 11299

12.4

XXX72

628

XXX89

611

9800 to 9899

11.0

11300 to 11399

12.6

XXX73

627

XXX90

610

9900 to 9999

11.1

11400 to 11499

12.6

XXX74

626

XXX91

609

10000 to 10099

11.2

11500 to 11-13

12.7

XXX75

625

XXX92

608

10100 to 10199

11.3

11600 to 11699

12.8

XXX76

624

XXX93

607

10200 to 10299

11.4

11700 to 11799

12.9

XXX77

623

XXX94

606

10300 to 10399

11.5

11800 to 11899

13.0

XXX78

622

XXX95

605

10400 to 10499

11.6

11900 to 11999

13.1

XXX79

621

XXX96

604

XXX80

620

XXX97

603

circuits of signal data translator A3. The difference-

XXX81

619

XXX98

602

frequency resulting from this second mixing is a single 1-

XXX82

618

XXX99

601

kHz frequency between 700 and 601 kHz, as indicated in

the table below, that also contains the error increment of

c. The output frequency of oscillator Q20 is dependent

the hf oscillator signal. This output is amplified by Q26,

filtered, and then further amplified by Q27. The resulting upon the 1-kHz frequency control selection that chooses an

sinousoidal signal is passed through clipper CR9-CR15 to appropriate crystal from Y1 through Y10. These crystals are

adjusted so that the oscillator output frequencies between

form a square-wave output signal.

3.007 and 3.016 MHz are obtained as shown in the following

table. Similarly, the output frequency of oscillator Q21 is

dependent upon the 10-kHz

KILOCYCLES

Mixer CR1 1

KILOCYCLES

Mixer CR1 1

indicator

output

indicator

output

KILOCYCLES

Oscillator Q20

KILOCYCLES

Oscillator Q20

reading

(MHz.)

reading

(MHz.)

indicator

output frequency

indicator

reading

(MHz.)

reading

(MHz.

XXX00

700

XXX33

667

XXXX0

3.007

XXXX5

3.012

XXX01

699

XXX34

666

XXXX1

3.008

XXXX6

3.013

XXX02

698

XXX35

665

XXXX2

3.009

XXXX7

3.014

XXX03

697

XXX36

664

XXXX3

3.010

XXXX8

3.015

XXX04

696

XXX37

663

XXXX4

3.011

XXXX9

3 .016

XXX05

695

XXX38

662

frequency control selection that chooses an appropriate

XXX06

694

XXX39

661

crystal from Y11 through Y20. These crystals are adjusted

XXX07

693

XXX40

660

so that the oscillator output frequencies lie between 3.707

XXX08

692

XXX41

659

XXX09

691

XXX42

658

and 3.617 MHz as shown in the following table. The output

XXX10

690

XXX43

657

of oscillators Q20 and A21 are mixed in Q22 to obtain a

XXX11

689

XXX44

656

single difference-frequency between 700 and 601 kHz.

XXX12

688

XXX45

655

This reference frequency is routed

XXX13

687

XXX46

654

XXX14

686

XXX47

653

XXX15

685

XXX48

652

kilocycles

Oscillator Q21

KILOCYCLES

Oscillator Q21

XXX16

684

XXX49

651

indicator

output frequency

indicator

output frequency

XXX17

683

XXX50

650

reading

(MHz.)

reading

MHz )

XXX18

682

XXX51

649

XXX00 to XXX09

3.707

XXX50 to XXX59

3.657

XXX19

681

XXX52

648

XXX10 to XXX19

3.697

XXX60 to XXX69

3.647

XXX20

680

XXX53

647

XXX20 to XXX29

3.687

XXX70 to XXX79

3.637

XXX21

679

XXX54

646

XXX30 to XXX39

3.677

XXX80 to XXX89

3.627

XXX22

678

XXX55

645

XXX40 to XXX49

3. 667

XXX90 to XXX99

3. 617

XXX23

677

XXX56

644

through a low-pass filter to remove spurious frequencies

XXX24

676

XXX57

643

XXX25

675

XXX58

642

that may have been generated through mixing, and then it

XXX26

674

XXX59

641

is applied to clippers CR7 CR8. The resulting squarewave

XXX27

673

XXX60

640

is coupled to the adder/phase-shift circuit of the

XXX28

672

XXX61

639

XXX29

671

XXX62

638

discriminator by follower Q23. A phase-shift circuit is

XXX30

670

XXX63

637

inserted in the signal path from 023 to discriminator

XXX31

669

XXX64

636

XXX32

668

XXX65

635

2-11