Equipment information:

Racal 9082 Generator
Manufacturer:
Racal
Model: 9082
Date: 1976
Category: Measurement instruments
Group: Generator
Description: SYNTHESIZED SIGNAL GENERATOR
Information:
                                    INTRODUCTION
1.1 The 9081 and 9082 are synthesized signal generators
designed primarily for the testing of radio communications
equipment. Although providing the precision of a
synthesizer system locked to a high-stability frequency
standard they retain the versatility of analogue-type tuning.
RF TUNING
1.2 A major feature of the instruments is their
'single-knob' tuning allied to a channelized mode of
operation. This enables the instruments to be tuned in steps
according to the channel spacing required. The r.f. tuning
automatically locks into the centre frequency of the
particular channel. Selection of the HOLD position on the
front panel switch then electronically disconnects the spin
wheel.
1 .3 A fine tune facility provides for interpolation between
channels, and this can also be carried out by an external
slow sweep voltage if desired. The carrier frequency is
displayed on an 8-digit LED readout in which the resolution
is varied to suit the particular tuning mode (Fast, Slow or
Hold) in use.
1.4 The Channel Spacing switch provides ten different
frequency spacings which conform to the internationally
agreed requirements of different authorities. A continuous
tuning facility (Zf) is provided in which the frequency
increments are reduced to a minimum value when using SLOW
tune mode.
RF OUTPUT
1.5 Automatic levelling maintains the output typically
within ±0.5dB over the entire frequency range. A switched
attenuator and vernier control provide an output
range from -130dBm to +3dBm, (+13dBm for models 9081H and
9082H), calibrated in both dBm and voltage units. An output
switch provides a multiply-by-two facility which permits a
doubling of the normal output levels in CW, FM and Phase
Modulation modes.
MODULATION FACILITIES
1.6 AM, FM and Phase Modulation (ζ2Μ) facilities are
provided. Three spot modulation frequencies (400Hz, 1kHz and
5kHz) are available from an internal oscillator.
External modulation can also be used, the maximum
frequencies permitted being 100kHz for FM, 5kHz for $M,
100kHz for AM on Model 9081 and 20kHz for AM on Model 9082.
1.7 The meter indicates both external and internal
modulation, and, as these can be applied simultaneously,
various arrangements of multiple modulation are feasible
(see para 2.4).
POWER SUPPLY
1.8 The instruments operate from nominal 110V or 220V a.c.
supplies, 45 to 440Hz.
Mains voltage selection is by means of two rear panel
switches which provide four
possible voltage selections and can be locked to the chosen
positions by a screwed plate, which allows the selected
voltage range markings to be seen. Refer to para. 5.1.
HANDBOOK NOTES Frequency Range
1.9 Although the signal generators have a specified
operating range extending to 520MHz, the design capability
is at least 540MHz. This higher figure with its range
subdivisions is used in the technical descriptions except
when referring to the actual operating ranges.

These manuals are available for the above equipment:

Racal -- 9082 -- Service and User Manual
File name: Racal-7289-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 153
Size: 6.76 Mbytes (7084501 Bytes)
Language: english
Revision:
Manual-ID/Number: WOH 7204
Date: 10 August 1983
Quality: Scanned document, all readable.
Upload date:
MD5: 39ddb6d799613316b1d94ab896a050f5
ed2kID: b8cbae532b6bbd6592f44725cdedad83
Downloads: 25 since 25 October 2015
Information:
SECTION 1 TECHNICAL SPECIFICATION AND SUPPLEMENTARY DATA
SECTION 2 DESCRIPTION OPERATION AND MAINTENANCE CHAPTER!
GENERAL DESCRIPTION
Page
INTRODUCTION 1-1
RF TUNING 1-1
RF OUTPUT 1-1
MODULATION FACILITIES 1-1
POWER SUPPLY 1 -2
HANDBOOK NOTES 1-2
CHAPTER 2 INTRODUCTION 2-1
POWER SUPPLY AND FREQUENCY STANDARD 2-1
OPERATING 2-1
1 RF Tuning 2-1
Output Level Setting 2-2
Modulation Mode Selection 2-3
Multiple Modulation 2-3
Switching Off 2-3 DESCRIPTION OF CONTROLS, INDICATORS AND
CONNECTIONS 2-4
CHAPTER 3 PRINCIPLES OF OPERATION
BRIEF DESCRIPTION 3-1
Introduction 3-^1
Carrier Tuning 3-1
Channel Spacing Reference Frequencies 3-1 Amplitude
Modulation and Automatic Level
Control 3-3
Frequency Modulation 3-3
Phase Modulation (ΟM) 3-3
Frequency Counter and Display 3“3
Tune (Spin Wheel) Encoder 3-4
CHAPTER 4 TECHNICAL DESCRIPTION
INTRODUCTION
LOGIC CIRCUIT SYMBOLS
MAIN OSCILLATOR (VCOl) ASSEMBLY 19-0841 4-1
LOGIC PCB ASSEMBLY 4-2
300kHz Reference Frequency 4-2
Fine Tune Reference 4-2
Tuning (Spin Wheel) Input 4-3
Pulse Multiplier and Up/Down Detector 4-3
Step Swi tch 4-3
Pulse Divider 4-3
Principles of Channel Spacing Control 4-4
Channel Spacing Control Circuit 4-5
DIVIDER AND PHASE DETECTOR ASSEMBLY 19-0846 4-6
Introduction 4-6
1N1 Counter 4-7
Digit Blanking 4-7
HF Divider 4-8
Phase Detector 4-9
Read Only Memory (ROM) 4-10
Half Octave Output 4-11
End Stop Control 4-11
OUTPUT SYSTEM ASSEMBLY 19-0843 4-11
Introduction 4-11
RF Input 4-11
Range Switching 4-11
Range 5 Filtering and Half Octave Selection 4-11
Range 4 Division and Filtering 4-12
Range 3 Division and Filtering 4-12
Range 2 Division and Filtering 4-12
Range 1 Mixer and Filtering 4-13
RF Output Amplifier 4-13
Output Metering 4-13
Amplitude Modulator Stage 4-13
ALC and Carrier Level Setting 4-13
X2 Output 4-14
AM Audio Input 4-14
120 MHz LOOP ASSEMBLY 19-0849
4-15
Introduction
4-15
120MHz Oscillator
4-15
Phase Detector Path and Display Blanking
4-15
300 kHz Reference Output
4-15
Master Reference Inputs
4-16
COUNTER ASSEMBLY 19-0845
4-16
INTRODUCTION
4-16
LOGIC VOLTAGE LEVELS
4-16
COUNTER PRINCIPLES
4-17
Reference Frequency
4-17
Time Base and Shift Delay Data
4-17
Multiplex Readout
4-17
Shift Data
4-20
CIRCUIT DESCRIPTION
4-21
Carrier Input
4-21
Range 1 Select
4-21
Time Base Drive
4-21
Time Base Encoding and Delay
4-21
Trailing Digit Blanking
4-22
Leading Digit Blanking
4-22
Complete Display Blanking
4-22
AUDIO OSCILLATOR ASSEMBLY 19-0847
4-23
Introduction
4-23
Audio Oscillator Circuit
4-23
FM LOOP ASSEMBLY 19-0844
4-24
Principles of the System
4-24
Circuit Description: 400kHz Loop
4-24
Sweep Circuit
4-26
Deviation Monitoring
4-27
Modulation Audio for FM
4-28
Phase Modulation (ζ^Μ)
4-2 8
FM Switching
4-28
POWER SUPPLY
4-30
CHAPTER 5
MAINTENANCE Page
POWER SUPPLY (MAINS) VOLTAGE SELECTION
5-1
REMOVAL OF COVERS
5-3
POWER SUPPLY TESTS
5-3
TUNING CHECKS
5-5
PRELIMINARY SYSTEM CHECKS
5-8
Output System
5-8
FM System
5-9
CALIBRATION
5-10
OUTPUT SYSTEM ASSEMBLY
5-10
AUDIO OSCILLATOR ASSEMBLY 19-0847
5-13
FM LOOP ASSEMBLY
5-14
DISTORTION CHECK
5-15
LEVEL ACCURACY CHECK
5-17
SPURIOUS CHECK
5-18
FAR-OFF AND CLOSE-IN NOISE CHECKS
5-19
RESIDUAL FM CHECK
5-20
FM DEVIATION CHECK
5-21
FM DISTORTION CHECK
5-23
PHASE MODULATION CHECK
5-23
AM DEPTH AND DISTORTION CHECK
5-24
FM FREQUENCY RESPONSE CHECK
5-26
AM FREQUENCY RESPONSE CHECK
5-27
RECONNECTION OF HIGH LEVEL AMPLIFIER
5-28
LE VE L ACC URACY C HECK
5-28
DISTORTION CHECK
5-29
AM DEPTH AND DISTORTION CHECK
5-29
ATTENUATOR CHECK
5-29
INTERNAL STANDARD OUTPUT CHECK
5-30
INTERNAL FREQUENCY STANDARD CALIBRATION
5-30
INTERNAL REVERSE POWER PROTECTION UNIT OPTION5-31
Racal-7289-Manual-Page-1-Picture
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