|Racal RA. 222G Receiver|
|Description:||TRANSISTORISED H. F. RECEIVER|
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
These manuals are available for the above equipment:
|Racal -- RA. 222G -- Service and User Manual|
|Manual Type:||Service and User Manual|
|Size:||6.55 Mbytes (6864763 Bytes)|
|Quality:||Scanned document, all readable.|
|Upload date:||25 October 2015|
|Downloads:||1204 since 25 October 2015|
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
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