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Redifon R499, Manual, Page: 5 / 20

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Summary of Contents for R499

Page 1: ...SPECIFICATION 2 INSTALLATION 3 SYSTEM DESCRIPTION 4 SELECTION OF OPTIONS 5 OPERATING INSTRUCTIONS 6 CIRCUIT DESCRIPTION OF RECEIVER 7 CIRCUIT DESCRIPTION OF REMOTE CONTROL SYSTEM 8 FAULT FINDING 9 REA...

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Page 3: ...I I I I I I 887 1 1 INTRODUCTION AND SPECIFICATION Fig 1 1 R499A RECEIVER GENERAL FREQUENCY COVERAGE RECEPTION MODES AGC IF AND AF GAIN SQUELCH OPTIMUM CONTROL SETTINGS ADDITIONAL FACILITIES SPECIFIC...

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Page 6: ...Fig 1 1 R499A RECEIVER 887 1...

Page 7: ...tically selected by a front panel Service switch but an additional switch enables the decay time constant to be divided by three and is of use during rapid fading The AGC can be switched off when not...

Page 8: ...fitted Frequency stability IF output IOOmV into 50 ohm at 1 4MHz short term 0 5 part in 106 or 4 Hz Power supply 24V d c or 100 125V and whichever is greater 200 250V at 50 60Hz long term I part in 10...

Page 9: ...SUPPLIES INTERCONNECTIONS Receiver only Receiver ISB Adaptor Receiver ISB Adaptor Remote Control Syste J Table 2 1 Inter unit Connections Table 2 2 18 core Cable maximum circuit resistance Table 2 3 1...

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Page 11: ...supplied for the socket is 50 ohm BNC PLA A 3 pin plug for connection of the mains supply The type of free mating socket for the plug is Bulgin P430 SKF A 25 way socket for the connection of the ISB A...

Page 12: ...21 V At a voltage of 24V the peak current drawn by the equipment is as follows 2 2 R499A R499A ISB ARUIOA R499A ISB ARUIOA RCI 16 ISB 1560mA 1850mA 2100mA INTERCONNECTIONS Receiver only I Connect the...

Page 13: ...eeded Table 2 2 18 core Cable maximum circuit resistance Function Motor switchin unit Recommended max SKA lines used line resistance Q fine tune 2 I 250 on off 4 9 20 audio monitor 6 14 60 service cha...

Page 14: ...t noise is audible from the loudspeaker 6 If both a c and d c supplies are connected switch off the a c supply and check that the equipment remains operational 2 4 Receiver ISB Adaptor The receiver ch...

Page 15: ...DESCRIPTION INTRODUCTION DESCRIPTION RF BOARD MIXER AND CHANNEL OSCILLATOR IF FILTERS Table 3 1 The Service Filters D TECTOR CIRCUITS AND RE INSERTION OSCILLATOR AF SECTION MAIN AGC SYSTEM Table 3 2 S...

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Page 17: ...circuits Separate RF filter circuits are utilized for reception of the MF and HF bands refer to Fig 10 1 the MF filter unit provides all RF filtering of MF signals whereas a succession of filters are...

Page 18: ...epending on the IF produced the four SSB filters A B G and H refer to Table 3 2 at the end of this Chapter will each realise USB LSB AM or degraded CW service For CW service using an SSB filter the ef...

Page 19: ...C system is operative and AGC voltage is available to un squelch the receiver e The output of the d c amplifier is fed to the squelch circuit and three AGC attenuators When the signal of the 887 1 d c...

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