Agrident GmbH, Steinklippenstr. 10, D-30890 Barsinghausen Phone +49 5105 582573-10 - Fax +49 5105 582573-17 ABR200 Antenna Tuning Manual Firmware 1.
ABR200 Antenna Tuning Manual © Copyright 2013 by Agrident GmbH TB All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without prior written permission of Agrident GmbH. Agrident GmbH reserves the right to make changes to any and all parts of this documentation without obligation to notify any person or entity of such changes.
ABR200 Antenna Tuning Manual Content 1 Introduction.......................................................................................................... 4 2 Tuning the antenna using ASR-PC-Demo ........................................................... 5 3 Antenna Tuning using an Oscilloscope ............................................................... 6 4 Capacitor selection ..............................................................................................
ABR200 Antenna Tuning Manual 1 Introduction If an antenna is connected to the ABR200 reader module, the antenna has to be adapted to the ABR200 reader module in order to get the optimum reading range. The inductance of the antenna builds a series resonant circuit together with the resonant circuit capacitors on the reader. The antenna tuning could be done by using an oscilloscope or the PC-Software ASR-PC-Demo.
ABR200 Antenna Tuning Manual The following picture shows how additional capacitors have to be connected to the ABR200: In this example there are 3 additional capacitors, which can be set with jumpers. On a customer’s PCB one capacitor (or maybe 2) with the correct value would be enough BUT the correct value is not the same for every unit. The antenna tuning has to be done for every reader individually! Change the capacitance until you have reached the maximum antenna voltage.
ABR200 Antenna Tuning Manual 3 Antenna Tuning using an Oscilloscope It is also possible to tune the antenna to the correct inductance and thus to the maximum voltage using an Oscilloscope. Connect the oscilloscope to Pin2 of the right connection terminal – that is the high voltage side of the resonant circuit.
ABR200 Antenna Tuning Manual Example for an antenna, where the inductance is too low: In that example the antenna inductance is too low and the coil is too much at the top of the ferrite (voltage too low and peak more to the right). Move the coil more to the middle of the ferrite. In case of air-coils or casted ferrite antennas, add capacitance.
ABR200 Antenna Tuning Manual Example for an antenna, where the inductance is too high: In that example the antenna inductance is too high and the coil is too much to the middle of the ferrite (voltage too low and peak more to the left). Move the coil more to the top of the ferrite. In case of air-coils or casted ferrite antennas, remove capacitance on your end.
