Operations and Maintenance Manual

JANUS

Multi-Protocol Reader 2.4 Maintenance Instructions

Confidential UM 360467-110 Revision: B Page 164 of 247

All information contained herein is proprietary to, and may only be used with express, written permission from, Kapsch TrafficCom Canada Inc.

FILE: UM 360467-110 REV B3 MPR 2.4 CLEAN.DOCX 03/02/2021 1:01

Kapsch TrafficCom

Figure 5-10: RF Cable Installation Schematic Mono-Static Operation (MRFM-S Plus only)

Performing Lane Tuning

Lane Tuning consists of selecting the frequencies to be used on the channels and setting the attenuation for the

channels to control the ERP of each lane. These are configured using the web interface. It is recommended that

Kapsch Services perform lane tuning to properly configure a site. If the integrator/operator wishes to perform

the lane tuning, the following guidelines apply.

• The same FDM channel frequency should not be used on adjacent lanes, including straddle and

shoulder (recommended at least 24ft. separation between antennas for in-line antennas, 21ft (18ft

lateral) between antennas for staggered antennas before frequencies can be re-used).

• Two TDM channels that are configured active in the same time slot should not be used on adjacent

lanes, including straddle and shoulder (recommended at least 24 feet separation between

antennas, 21ft (18ft lateral) between antennas for staggered antennas between active antennas).

• The TX attenuation should be adjusted to obtain capture zones nominally 8 to 12 ft. (1.83 to 2.44 m.)

along direction of vehicle traffic.

ATTENTION: When installing or replacing a MRFM-S, RF cables, circulator, or antenna, the lane must be

re-tuned.

The Synchronization circuit

Synchronization is required between readers located within reader-reader interference range, or which have

overlapping or near-adjacent capture zones, or which may have RF signal reflections (interference) due to any

one or combination of varying vehicle sizes, varying traffic patterns or fixed site terrain features. The sync

feature eliminates interference between the readers that might otherwise reduce system performance. The

synchronization circuit connects SPMs together in a star network. The CTM does the synchronization of the RF

module interrogation.