Equipment information
Racal RA. 222K Receiver
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Model:
RA. 222K
Date:
1966
Category:
Group:
Description:
TRANSISTORISED H. F. RECEIVER
Information
BRIEF DESCRIPTION
1. The H. F. Receiver Type RA. 222 is a fully transistorised
unit that has been designed for operation in SSB and DSB
radio systems with the Racal
range of SSB transmitters and radio telephones. Receiver
muting is available from connections at the rear of the
Receiver for when it is in close proximity to a Transmitter.
2. Eight crystal controlled channels are available covering
the frequency range of 1.5 to 24 Mc/s. All r.f. circuits are
pre-tuned plug-in units
and channel selection is by means of an eight position
rotary switch. The eight channel crystals operate in a
thermostatically controlled oven.
3. Switched selection is available for upper or lower
sideband on SSB, and DSB or CW operation.
4. The audio output circuit feeds an internal speaker, an
external loudspeaker terminal at the rear of the receiver, a
headphone jack socket
on the front panel and a line output at 600 ohms impedance.
5. The unit is of robust construction and suitable for bench
or 19 inch rack mounting.
VARIANTS
6. Alternative Power Supply models are produced for use on
a.c. power,
12 volt and 24 volt d.c. supplies. In addition there are
four versions
available for operation from each of these power supplies
with facilities as detailed below: -
A. C. Powered
RA. 222A SSB, AM and CW reception.
RA. 222B SSB, AM and CW reception with squelch control
fitted.
RA. 222C SSB, AM and CW reception with extended control
module MA. 34 6 fitted.
RA. 222D SSB, AM and CW reception with squelch and
extended control module MA. 346 fitted.
12 Volt d.c. Powered
RA. 222G SSB, AM and CW reception.
RA. 222H SSB, AM and CW reception with squelch control
fitted.
RA. 222J SSB, AM and CW reception with extended control
j module MA. 346 fitted.
RA. 222K SSB, AM and CW reception with squelch
Manual Type:
Service and User Manual
Pages:
136
Size:
6.55 Mbytes (6864763 Bytes)
Language:
english
Revision:
2
Manual-ID:
149
Date:
Quality:
Scanned document, all readable.
Upload date:
2015 10 25
MD5:
1073854e6210a7ec798c7363bebf37c6
Downloads:
3621
Information
Operating and Maintenance Manual
TECHNICAL SPECIFICATION
CHAPTER 1 GENERAL DESCRIPTION
BRIEF DESCRIPTION 1-1
VARIANTS 1-1
CHAPTER 2 INSTALLATION AND SETTING-UP
INITIAL PROCEDURE 2-1
POWER SUPPLIES 2-1
AERIAL MUTING 2-2
EXTERNAL LINE OUTPUT 2-2
PRELIMINARY SETTING-UP 2-2
EXTERNAL LOUDSPEAKER 2-4
EXTENDED CONTROL 2-4
CHAPTER 3 OPERATING INSTRUCTIONS
L.S.B. OPERATION 3-1
U.S. B. OPERATION 3-2
A.M. OPERATION 3-2 C.W. OPERATION 3-2
CHAPTER 4 PRINCIPLE OF OPERATION
INTRODUCTION 4-1
R.F. Amplifier 4-1
FIRST MIXER AND CHANNEL Oscillator 4-1 3. 7 Mc/s Oscillator
AND SECOND
MIXER-BUFFER Amplifier 4-1
3 Mc/s I. F. Amplifier 4-2
AUTOMATIC GAIN CONTROL (A. G. C. ) 4-2 DETECTOR AND CARRIER
RE-INSERTION Oscillator 4-2
B.F.O. 4-2
A. F. STAGES 4-2 SQUELCH 4-3
CHAPTER 5 CIRCUIT DESCRIPTION
INTRODUCTION 5-1
R.F. UNIT 5-1
CHANNEL Oscillator -5-4
I. F. UNIT 5-5
3 Mc/s CARRIER RE-INSERTION Oscillator 5-7
BEAT FREQUENCY Oscillator 5-8
AUDIO Amplifier UNIT 5-8
SQUELCH UNIT 5-10
POWER UNITS 5-10
EXTENDED CONTROL Receiver MODULE MA. 346 5-12 PRESET 3 Mc/s
CARRIER RE-INSERTION Oscillator 5-14
SECTION 2 MAINTENANCE
CHAPTER 1 TEST EQUIPMENT 1-1
CHAPTER 2 DISMANTLING AND RE-ASSEMBLY
INTRODUCTION 2-1
REMOVAL OF CASE (Bench Models) 2-1
REMOVAL OF FRONT PANEL 2-1
CHANNEL Oscillator AND CRYSTAL OVEN 2-1
REMOVAL OF I. F. UNIT 2-2
REMOVAL OF Power Supply UNIT 2-2
EXTENDED CONTROL MODULE MA. 346 2-2
REMOVAL OF R. F. UNIT 2-4
REMOVAL OF FILTER COUPLING BOARD 2-5
REMOVAL OF 3. 7 Mc/s CRYSTAL Oscillator 2-6
REMOVAL OF 3 Mc/s RE-INSERTION Oscillator 2-6
REMOVAL OF B. F. O. 2-6 REMOVAL OF AUDIO Amplifier AND
SQUELCH UNIT 2-7 REMOVAL OF PRESET 3 Me/s RE-INSERTION
Oscillator 2-7
CHAPTER 3 INITIAL FAULT LOCATION
INTRODUCTION 3-1
UNIT CHECKS 3-1
FAULT LOCATION CHART 3-2
CHAPTER 4 GENERAL FAULT LOCATION
INTRODUCTION 4-1 FAULT LOCATION CHART
No Speaker Output 4-2
Squelch In-operative 4-4
No I. F. Input to Detector 4-6
AGC Voltage Incorrect 4-7
No Output with Channel Signals at Aerial socket 4-7 Receiver
not Operating on frequencies
between 1. 5 and 7 Mc/s 4-8 Receiver not Operating on
frequencies
between 7 and 14 Mc/s 4-8 Receiver not Operating on frequencies
between 14 and 24 Mc/s 4-9
Receiver not Operating on S. S. B. or TUNE 4.-9
Receiver not Operating on C. W. 4-9 Preset version of 3 Mc/s
Carrier Re-insertion
Oscillator 4-10
CHAPTER 5 RE-ALIGNMENT
INTRODUCTION 5-1
INITIAL CHECKS 5-1
20 VOLT REGULATED SUPPLY RE-ADJUSTMENT 5-1
ADJUSTMENT OF A. G. C. 5-1 A, F. OUTPUT TRANSISTOR D. C. BALANCE
AND QUIESCENT CURRENT ■ 5-2
A. F. UNIT SYMMETRICAL BALANCE 5-2
3 Mc/s CARRIER RE-INSERTION Oscillator
RE-ALIGNMENT 5-2
B.F.O. RE-ALIGNMENT 5-3
3. 7 Mc/s Oscillator RE-ALIGNMENT 5-4
I. F. RE-ALIGNMENT 5-4 TO CHANGE FREQUENCY OF A CHANNEL 5-6
PRESET 3 Mc/s CARRIER RE-INSERTION
Oscillator 5-7
CHAPTER 6 COMPONENTS LIST
