OPERATION GUIDE Simple antenna matching indicator tool Operation guideVersion 1.0 (Jun. 2020) Circuit Design, Inc. 7557-1, Hotaka, Azumino-city, Nagano, 399-8303, JAPAN Tel: + +81 -(0)263-82-1024 Fax: + +81 -(0)263-82-1016 e-mail: [email protected] http://www.circuitdesign.jp OG VSWR Checker v10e 1 Circuit Design, Inc.

OPERATION GUIDE

CIH&UII MM. OPERATION GUIDE 1. Summary The VSWR checker is a simple antenna matching indicator tool that allows you to quickly and easily check the match between antenna and RF module. If antenna and RF module impedance is not matched, the transmitting signal cannot transfer the energy to the antenna and some energy will be lost due to reflection. To allow the antenna to emit efficiently, it is necessary to match the impedance of the antenna to the transmitter. This tool can compare the forward and reflected waves and display return loss as VSWR value allowing simple confirmation of impedance...

cm&uii nimm. OPERATION GUIDE OG VSWR Checker v10e 4 Circuit Design, Inc.

OPERATION GUIDE 5. Name and function of each part (i) (1) SMA connector (SMA Female) Connection to antenna (2) SMA connector (SMA Male) Connection to RF module (3) QR Code When accessed, this takes you to the webpage for the VSWR checker (page is in Japanese) (4) Battery box Use 2 x LR44 batteries. When inserting battery match to the “+” mark on the board top side (5) Power switch (6) Power supply LED When toggling the power switch, the LED glows red. (7) Control knob (VR1) Use for adjustment before taking measurement. (8) LED (ADJ) VR Led lights green when adjusting VR1 (9) LED (1.2 to 4.0)...

cm&uii nimm. OPERATION GUIDE 6. Method of use Preparation ■RF module (MU-4-434, SLR-434M etc.) ■Conversion cable (if necessary) ■Antenna ■Blade type screwdriver Procedure OG VSWR Checker v10e 6 Circuit Design, Inc.

OPERATION GUIDE mmi Dim inc. Measurement result VSWR 1.2 to 1.8 Return Loss is 10% or less. Antenna impedance shows good match. VSWR 2.5 to 4.0 A large amount of the transmitted signal is being reflected and is undergoing loss. Make adjustment such as increasing the area of the GND plane. For details refer to the video link below. https://youtu.be/SpX45xkIoes VSWR determination values Adjust to get as low VSWR as possible E.g. Transmission using 10 mW, VSWR at 3.0 means loss is 2.5 mW and amount radiated by antenna is 7.5 mW. OG VSWR Checker v10e 7 Circuit Design, Inc.

OPERATION GUIDE Customers are advised to consult with Circuit Design sales representatives before ordering. Circuit Design believes the provided information is accurate and reliable. However, Circuit Design reserves the right to make changes to this product without notice.  Circuit Design products are neither designed nor intended for use in life support applications where malfunction can reasonably be expected to result in significant personal injury to the user. Any use of Circuit Design products in such safety-critical applications is understood to be fully at the risk of the customer and...

cm&uii nimm. OPERATION GUIDE The copyright of this manual belongs to Circuit Design, Inc. No part of this document may be reprinted, reproduced or modified without our permission OG VSWR Checker v10e 9 Circuit Design, Inc.