Tait TEL0048 One way paging transmitters T856-26-1010 & T856-26 User Manual 8c500 a3 bk

Tait Limited One way paging transmitters T856-26-1010 & T856-26 8c500 a3 bk

Contents

Diagram of units

M850-00T856/857 General InformationC1.3Copyright TEL 31/09/98The photograph in Figure 1.1 on the nextpage will help you to identify the maincircuit blocks in the T856.There is a similar photograph in Figure4.4 which shows the main tuning andadjustment controls.Extending both these fold-outs willallow you to refer to both photographswhile using the manual.The photograph in Figure 1.2 on the nextpage shows the T856 front panel con-trols.
C1.4T856/857 General InformationM850-0031/09/98 Copyright TELFigure 1.1 T856 Main Circuit Block Identification Figure 1.2 T856 Front Panel Controls12345 67 8ABC910Key:1234567low pass filterPAexciter drive amplifieraudio processorVCOregulatorssynthesiser8910ABCmicrocontroller and CTCSSduct for cabling to extra D-range (if fitted)D-rangeRF outputD-range connector (“D-range 1”) incl. audio in & DC in(refer to Section 2.2 in Part F)microcontrollerOn LEDThe On LED is lit when theT856 is transmitting.Carrier SwitchKeys the transmitter (whiledisabling the 600Ω line andmicrophone audio).Supply LEDThe Supply LED is lit whenDC power is supplied to thetransmitter.Line SensitivitySets the gain of the 600Ω lineinput of the audio processor.Microphone SocketFor connecting a T800-80 micro-phone to allow local control ofthe transmitter. The 600Ω line isdisabled when the PTT button ispressed.
M850-00T856/857 General InformationC1.5Copyright TEL 31/09/98The photograph in Figure 1.3 on the nextpage will help you to identify the maincircuit blocks in the T857.There is a similar photograph in Figure4.5 which shows the main tuning andadjustment controls.Extending both these fold-outs willallow you to refer to both photographswhile using the manual.The photograph in Figure 1.4 on the nextpage shows the T857 front panel con-trols.
C1.6T856/857 General InformationM850-0031/09/98 Copyright TELFigure 1.3 T857 Main Circuit Block Identification Figure 1.4 T857 Front Panel Controls12345689ABC7Key:1234567low pass filterexciter drive amplifieraudio processorVCOregulatorssynthesisermicrocontroller and CTCSS89ABCduct for cabling to extra D-range (if fitted)D-rangeRF outputD-range connector (“D-range 1”) incl. audio in & DC in(refer to Section 2.2 in Part F)microcontrollerOn LEDThe On LED is lit when theT857 is transmitting.Carrier SwitchKeys the exciter (whiledisabling the 600Ω lineand microphone audio).Supply LEDThe Supply LED is lit whenDC power is supplied to theexciter.Line SensitivitySets the gain of the 600Ω lineinput of the audio processor.Microphone SocketFor connecting a T800-80 micro-phone to allow local control ofthe exciter. The 600Ω line is dis-abled when the PTT button ispressed.
M850-00T856/857 Functional TestingC4.9Copyright TEL 31/09/98Figure 4.4 T856 Main Tuning & Adjustment ControlsR481#CV475C6L1RV320shutdownRV210line sensitivitySW230carrier=IC700TCXOL481RV310power controlRV220compression levelRV805CTCSSlevel adjustPL205 PL220 PL215 PL210SK805temperatureIC350 pin 3RV330shutdownpower levelThe photograph printed at rightwill help you to identify the maincontrols used in tuning and adjust-ing the T856.There is a similar photograph inFigure 1.1 which shows the maincircuit blocks.Extending both these fold-outs willallow you to refer to both photo-graphs while using the manual.
C4.10T856/857 Functional TestingM850-0031/09/98 Copyright TEL
M850-00T856/857 Functional TestingC4.11Copyright TEL 31/09/98Figure 4.5 T857 Main Tuning & Adjustment ControlsC6L1RV210line sensitivitySW230carrier=IC700TCXORV220compression levelRV805CTCSSlevel adjustPL205 PL220 PL215 PL210SK805The photograph printed at rightwill help you to identify the maincontrols used in tuning and adjust-ing the T857.There is a similar photograph inFigure 1.3 which shows the maincircuit blocks.Extending both these fold-outs willallow you to refer to both photo-graphs while using the manual.

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