Marconi TF 2950 Communications Test Set
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INTRODUCTION The Mobile Radio Test Set, TF 2950 has been designed as a fully transistorised, multipurpose unit capable of being driven from its own rechargeable batteries. The main application is for the testing, adjustment and servicing of mobile radio communications equipment operating in the VHF and UHF frequency bands. 1) An AM/FM signal Generator covering the appropriate mobile radio VHF and UHF communications bands. 2) A modulation monitor for the measurement of amplitude modulation depths up to 80% and . peak frequency deviations up to +25 kHz. 3) An in-line power meter with a separate 15 W r . f . load. 4) An audio voltmeter having a sensitivity of 10 mV f. s . , an input impedance of 100 кй and a bandwidth of 20 kHz. 5) An audio Oscillator with a nominal frequency of 1 kHz which is adjustable by up to +1% and an output level variable up to 3 V. 5) An audio Oscillator with a nominal frequency of 1 kHz which is adjustable by up to +1% and an output level variable up to 3 V .
Service and User Manual
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2016 06 05
Contents GENERAL INFORMATION Introduction Data Summary Accessories Supplied Chapter 2 OPERATION 2.1 Preparation for use 2.2 Power Supplies 2.3 Signal Generator controls 2.3.1 Signal Generator operation 2.4 R .F . Power Meter controls 2.4.1 R .F . Power Meter operation 2.5 1 kHz Oscillator controls 2.5.1 1 kHz Oscillator operation 2.6 A.F. Voltmeter controls 2.6.1 A.F. Voltmeter operation 2.7 Modulation Monitor controls 2.7.1 Modulation Monitor operation Chapter 3 TECHNICAL DESCRIPTION 3. 1 Power supplies 3.2 Voltage Stabiliser Circuit 3. 3 Audio Voltmeter 3.4 1 kHz Audio Oscillator 3.5 Modulation Monitor 3.5.1 F.M. Circuitry 3.5.2 A.M. Circuitry 3.6 Signal Generator 3.7 R .F . Power Meter Chapter 4 & 5 MAINTENANCE AND REPAIR will be issued when available Fig. 5.1P.C.B. Component Layout Fig. 5.2 Location of Preset controls Chapter 6 REPLACEABLE PARTS 6.1 Introduction 6.2 Ordering 6.3 Parts List Chapter 7 CIRCUIT DIAGRAMS Fig. 7.1 Inter-unit Wiring Circuit Diagram Fig. 7.2 Power supply, A.F. 1 kHz Oscillator, A.F. Voltmeter Circuit Diagram Fig. 7.3 Modulation Monitor Circuit Diagram Fig. 7.4 VHF/UHF AM/FM Signal Generator Circuit Diagram Fig. 7.5 R .F . Power Meter Circuit Diagram
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