482
TMAA01-01 Line-Interface Board
TM8100/TM8200 Service Manual
© Tait Electronics Limited
November 2007
The comparators (in U1) operate off a single sided regulated 5V supply.
U1 pins 2,4 and 5 provide receiver gate delay. Once the busy signal is not
active, C4 charges through R12 and causes U4 to go low. Once charging
exceeds the voltage at U1 pin5. This also locks out the keying state until this
delay has occurred (U6 pin 5).
17.8.3
Data Communication
The Line Interface circuitry is designed to provide RS-232 and RS-422 data
communication. RS-232 is provided by U9, but if RS-422 is required, U9
is removed and replaced by U2 and U10. Also resistors R15,16,43 and 47
need to be fitted.
17.8.4
Power Supply
The power supply for the line-interface board comes from the radio via
the internal options connector and is a 13.8 V switched supply. Digital
logic components are used in the line-interface board so there is a 5 V
regulator provided.
Initially the 13.8V from the radio is filtered and used for the audio line
driver (U5) with reference to analogue ground. This 13.8V is also used to
supply the 5V regulator, which is filtered separately for either 5V digital or
analogue devices. A simple voltage divider is used to provide a 2.5V half-rail
for the digital and a 2.2V rail for the analogue sections.
Содержание TM8100 mobiles
Страница 1: ...TM8100 mobiles TM8200 mobiles Service Manual MMA 00005 05 Issue 5 November 2007...
Страница 10: ...10 TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 12: ...12 TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 20: ...20 Introduction TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 64: ...64 Description TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 106: ...106 TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 134: ...134 General Information TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 168: ...168 Servicing Procedures TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 184: ...184 Interface Fault Finding TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 246: ...246 Frequency Synthesizer Fault Finding TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 340: ...340 Transmitter Fault Finding 25W TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 398: ...398 Transmitter Fault Finding 25W TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 422: ...422 CODEC and Audio Fault Finding TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 464: ...464 Spare Parts TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 488: ...488 TMAA01 01 Line Interface Board TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 541: ...TM8100 TM8200 Service Manual Installing a Remote Kit 541 Tait Electronics Limited November 2007 Circuit Diagram...
Страница 544: ...544 Installing a Remote Kit TM8100 TM8200 Service Manual Tait Electronics Limited November 2007 Circuit Diagram...
Страница 578: ...578 TMAA04 04 Crossband Linking Cable TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 592: ...592 TMAA10 01 Desktop Microphone TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Страница 612: ...612 TMAA10 08 Desktop Microphone TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...