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TX Techniques TX FM1, Technical Manual

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17

TX-FM1/S/R/A Technical Manual

www.txtechniques.co.uk

7.5 FM1-RDS PCB

7.6 FM1-PA PCB

RF IN

+24VDC SUPPLY

RF OUT

MOS-FET

PA STAGE

7-POLE

RF LOW-PASS

FILTER

INPUT MATCHING

NETWORK

SELF-BIAS

OUTPUT MATCHING

NETWORK

MASTER

CLOCK

SOURCE

uPC

DIVIDE

BY 8, 12, 24

uPC

DATA SINE

SYNTHESIS

SUPPRESSED

CARRIER

MODULATOR

MATRIX

AMPLIFIER

SUPPRESSED

CARRIER

MODULATOR

SQUARE WAVE

TO SINE WAVE

FILTERS

uPC DATA EEPROM

WITH REALTIME CYCLIC

REDUNDANCY CODE

GENERATOR

DTMF DETECTOR

WITH ALC &

SERIAL OUT

AF (DTMF)

PROCESSED

AUDIO (L)

PROCESSED

AUDIO (R)

COMPOSITE

CLIPPING

EXCITER

EXCITER

Summary of Contents for TX FM1

Page 1: ...for any direct indirect incidental consequential or other damage or loss alleged in connection with the supply or use of this product The information contained in this document is subject to change wi...

Page 2: ...stments 5 1 Carrier Frequency Setting 10 5 2 Carrier Frequency Fine Tuning 10 5 3 RF Output Power 10 5 4 Audio Processor Input Level 10 5 5 Audio Processor Individual Band Adjustment 10 5 6 Audio Proc...

Page 3: ...CB 16 7 5 FM1 RDS PCB 17 7 6 FM1 PA PCB 17 7 7 FM1 RF PCB 18 7 8 FM1 LCD PCB 18 8 Wiring 8 1 Wiring Diagram 19 9 Circuit Diagrams 9 1 FM1 EXCI PCB 20 9 2 FM1 ALC L PCB 21 9 3 FM1 ALC R PCB 22 9 4 FM1...

Page 4: ...zero ohm links Every connection to every PCB is pluggable allowing fast serving The use of through hole components means components can be replaced easily by engineers using traditional methods The TX...

Page 5: ...level sounds and noise Multiple peak limiting stages provide the control needed to ensure that final clipping circuitry operates with negligible distortion or audible effect across all kinds of progr...

Page 6: ...st adhere to safety regulations and the requirements of the relevant authorities We recommend that at least two people are present during installation Keep a file containing installation instructions...

Page 7: ...n of the rear heatsink which can be impeded if the unit is placed on a flat surface The transmitter should be situated away from heat sources The transmitter should be connected to a power supply only...

Page 8: ...s been spilled into it or The transmitter has been exposed to rain or The transmitter does not appear to operate normally or exhibits a marked change in performance or The transmitter has been dropped...

Page 9: ...electing RF provides monitoring of forward RF FWD and reflected RF REF power measurements AF provides a graphical PPM meter showing the sum of the LEFT and RIGHT audio inputs Please note that this is...

Page 10: ...selected on the internal frequency setting switches the unit will not initialise Instead it will display ALARM SYSTEM ERROR after a short while Disconnect the mains supply select a valid frequency int...

Page 11: ...en if it is not evident when previewed without audio processing Also CD recordings mastered at very high levels often drive many CD players reproduction circuitry into clipping distortion If after ens...

Page 12: ...been activated the RDS OFF tones are not received within 4 minutes the TX FM1 S R A will automatically cancel the TA mode Abuse of this system may incur penalties from the broadcasting Authorities It...

Page 13: ...right audio channel and R32 left audio channel on the FM1 ALC board determines the overall level entering the multiband audio processor Decrease Normal Increase 1K5 min 2K2 4K7 max Use of values othe...

Page 14: ...ting VR4 on the FM1 RDS PCB This setting requires the use of a modulation monitor connected to the front panel AF monitor BNC socket 5 12 MPX Subcarrier Null The DSSC generation of the stereo multiple...

Page 15: ...d and presented to the LCD meter and the DTMF TA controller as a mono source via socket PL5 The audio passes through IC3 A the gain of which is controlled by OR1 in its feedback path The output of IC4...

Page 16: ...has the effect of maintaining a constant modulation level across the entire FM band TR2 and TR3 form a Cascode oscillator which is buffered by TR4 and switched by TR5 This allows the exciter output to...

Page 17: ...and SW2 6 7 RF Amplifier The RF amplifier design uses a Motorola RF MOSFET device C1 L1 C2 and L2 form an input matching circuit ZD1 rectifies the RF forming a bias for TR1 and R1 in conjunction with...

Page 18: ...R SWITCHING ACTIVE START CIRCUIT RECTIFIERS FILTER LIMITING DETECTION CIRCUIT PWM PFC CONTROL O V P O T P O L P 24Vdc 24Vdc 24Vdc 5Vdc 12Vdc VFO PLL uPC BCD FREQUENCY SELECT SWITCHES FILTER AND ERROR...

Page 19: ...CTIFIERS PRECISION RECTIFIERS AF IN AF OUT AF OUT AF IN DTMF DETECTOR FRONT PANEL METER AUDIO RC LOWPASS FILTER COMPRESSOR LIMITER COMPRESSOR LIMITER FINAL CLIPPER 15kHz LOW PASS FILTER COMPRESSOR LIM...

Page 20: ...LF BIAS OUTPUT MATCHING NETWORK MASTER CLOCK SOURCE uPC DIVIDE BY 8 12 24 uPC DATA SINE SYNTHESIS SUPPRESSED CARRIER MODULATOR MATRIX AMPLIFIER SUPPRESSED CARRIER MODULATOR SQUARE WAVE TO SINE WAVE FI...

Page 21: ...hnical Manual www txtechniques co uk 7 7 FM1 RF PCB 7 8 FM1 LCD PCB AUDIO MPX INHIBIT FWD RF INHIBIT SOUNDER REF RDS TP INHIBIT LCD DISPLAY uPC A D CONVERTOR ROTARY ENCODER FWD REF POWER MEASUREMENT R...

Page 22: ...19 TX FM1 S R A Technical Manual www txtechniques co uk 8 Wiring Diagram REF FWD...

Page 23: ...9 Circuit Diagrams 9 1 FM1 EXCI...

Page 24: ...9 2 FM1 ALC Left Audio Channel...

Page 25: ...9 3 FM1 ALC Right Audio Channel...

Page 26: ...9 4 FM1 AP...

Page 27: ...9 5 FM1 RDS...

Page 28: ...9 6 FM1 PA...

Page 29: ...9 7 FM1 RF...

Page 30: ...9 8 FM1 LCD...

Page 31: ...LVD 73 23 EEC EN60215 and amendments where applicable EMC Directive 89 336 EEC EN55022 Class 2 EN61000 4 2 EN61000 4 3 EN61000 4 4 EN61000 4 5 EN61000 4 6 EN61000 4 11 R TTE Conformity was assessed vi...

Page 32: ...tereo Encoder Separation Better than 42dB Subcarrier null Better than 50dB Pilot stability 2Hz typical RDS Encoder Blocks handled 0B 2A Features PI PTY AF PS RadioTEXT TP TA TA remote switching DTMF t...

Page 33: ...techniques co uk 30 We reserve the right to alter specifications without notice TX Techniques Ltd Unit 25 Claro Court Business Centre Claro Road Harrogate HG1 4BA Tel 44 0 1423 565394 Fax 44 0 1423 52...

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