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No part of this manual may be copied, transcribed, translated or reproduced in any manner or form 
whatsoever, for commercial purposes, without obtaining prior written permission from Q-MAC 
Electronics Pty Ltd.  However, limited copying is permitted for private use providing authorship is 
acknowledged. 

 

 

 

© Copyright Q-MAC Electronics  Pty Ltd, 2003. 

 

142 Hasler Road 

Osborne Park, WA 6017 

PO Box 1334 

Osborne Park Business Centre, WA 6916 

AUSTRALIA 

 

Australia: 

 Phone 08 - 9242 2900, Fax 08 - 9242 3900 

International:

  Phone 618 - 9242 2900, Fax 618 - 9242 3900 

 
 
 
 
 
 
 
 
 

TA-90  

Automatic Antenna Tuner for Vehicle Whip 

 

 
 
 
 
 
 
 
 

First Edition 

Print date:  December 1997

 

 

 

Author:  Rod Macduff 

 

Literature Reference Number:  TECH04.PUB  

 

Part Number:  QM1021 

 

 

 

Summary of Contents for TA-90

Page 1: ...private use providing authorship is acknowledged Copyright Q MAC Electronics Pty Ltd 2003 142 Hasler Road Osborne Park WA 6017 PO Box 1334 Osborne Park Business Centre WA 6916 AUSTRALIA Australia Phon...

Page 2: ...ion 3 Mechanical assembly 4 Section 4 Functional overview 5 Section 5 Block diagram 7 Section 6 Circuit description and Schematic Diagrams 9 Section 7 Fault finding 14 Section 8 Hints and tips 15 Sect...

Page 3: ...decapitation as the whip is relatively inexpensive and readily available 3 Road visibility is not impaired by the tuner when fitted to a vehicle 4 The TA 90 is versatile It can be used on trucks buses...

Page 4: ...an 3 seconds Tuning method Binary weighted relay switched inductors perform tune whilst transformer achieves match Dimensions Tuner housing 221 L x 146 W x 62 D Tuner with mounting plate 242 L x 206 W...

Page 5: ...B External RF input to the TA 90 is applied on a standard UHF S0 239 socket DC power from the HF 90 transceiver is taken to two 5 16 inch circular lugs this is also the tune activation signal A 4mm hi...

Page 6: ...reactive value is very low and resistance is approximately 40 ohms In order to transfer maximum power to the above network the antenna tuner must Cancel the capacitive reactance jXc 1 000 000 f in MH...

Page 7: ...the tuning sequence is initiated by a supply interruption of 400ms On turn on all inductors are switched out and the matching transformer is switched out The TA 90 then goes through its tuning sequenc...

Page 8: ...ntrol section of the TA 90 comprises of a sensor section microcontroller section and output drive section The sensor section consists of an optically linked antenna current sensor dynamic range extend...

Page 9: ......

Page 10: ...ed out by RL1 a low loss 47pF capacitor C67 is switched in series with the RF input to allow the tuning of antennas which are inductive A scan amplifier comprising JFETs Q2 and Q3 with associated pass...

Page 11: ......

Page 12: ...digital converter comprising counter U9 DAC U10 and comparator U8 allows the microprocessor to read the antenna current Control of the inductor relays transformer relay RL1 and scan amplifier relay RL...

Page 13: ......

Page 14: ...P3 1 L10 P3 2 L11 P3 3 L12 P3 4 L13 P3 5 L14 P3 6 L15 P3 7 INPUT FROM A TO D COMPARATOR LOW THRESHOLD REACHED PORT 2 Address High Order Outputs Plus miscellaneous high order memory mapped outputs P2...

Page 15: ...press the TUNE on the HF 90 Monitor VSWR or antenna current during tune cycle IF VSWR is less than 2 5 1 or antenna current is greater than 0 8 ampere then the unit is working satisfactorily Repeat th...

Page 16: ...f the BNC coaxial connector This will allow connection of a short ground wire directly to vehicle chassis Connection to the solder lug may be either using solder or a spade slide connector If howling...

Page 17: ...R71 3K3 1206 SMD 5 00332 22 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R22 R25 10K 1206 SMD 5 00103 1 R28 33K 1206 SMD 5 00333 1 R30 100K 1206 SMD 5 10104 1 R29 330K 1206...

Page 18: ...3 8UH 29T TOROID 37020 1 L8 5 59UH 27T TOROID 37022 1 L9 8 2UH 35T TOROID 37023 1 L10 12 1UH 34T TOROID 37024 1 L11 17 7UH 43T TOROID 37025 1 L12 26UH 55T TOROID 37026 1 L13 44 2UH 58T TOROID 37027 1...

Page 19: ...T 60200 2 Q2 Q3 N80C31 MICRO 76031 1 U1 27C64 EPROM 77064 1 U2 74HC14D INVERTER 73014 1 U4 74HC574DW LATCH 73574 1 U3 74HC4040D COUNTER 73040 1 U9 DAC0800M DAC 78800 1 U10 ULN2003L DARLINGTON 72003 3...

Page 20: ...10 PCB OVERLAYS 1...

Page 21: ......

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