Antenna System Guidelines; Before You Install An Antenna System - Philips Avalon CTS M2720A Service Manual

1 General Information
• Keep the size of the antenna system as small as possible. Telemetry system performance will degrade as
the system size increases. The larger a system is, the greater the potential for receiving interfering
signals. In addition, as more devices are added to the antenna system, the noise generated by the
antenna system itself increases.
• A patient location protocol is critical to a telemetry system. If a life-threatening event occurs, the
clinician must be able to locate the patient quickly. The importance of this increases as the antenna
system size increases.
• Philips Medical Systems has no control over the RF environment in the hospital. If interference exists at
the operating frequencies, telemetry system performance will be affected. Careful selection of
frequencies for all wireless devices used within a facility (telemetry transmitters, walkie-talkies,
ambulance radios, other wireless medical devices, etc.) is important to prevent interference between
them. Frequency management is the responsibility of the hospital.

Antenna System Guidelines

The Avalon CTS (M2720A) is compatible with the dual band antenna system components used with the
M2600A adult telemetry system. Antenna systems must be designed according to adult telemetry system
rules, and presales activities and site preparation must be done according to the existing M2600A series
antenna system rules. These activities are not bundled into the product price and have to be ordered
separately from the Philips Medical Support Organization.
In addition to the M2600A antenna system design rules, the following antenna specifications apply to the
Avalon CTS:
• Only original M2600A antenna system components will be supported.
• The antenna spacing must not exceed a radius of 10m (32ft).
• Existing antenna systems used for M1310A with 15.5m (51ft) antenna radius spacing do not comply
and must be redesigned to work with the Avalon CTS.
• A mixture of Avalon CTS and other supported Philips telemetry devices (for example, M1310A or
M2600A Adult Telemetry Transmitter/Receiver) on the same antenna system may be supported. Please
see below for further details of how to configure and design a mixed telemetry system.
• Frequency converters used in USA with M2600A adult telemetry cannot be used with the Avalon CTS.
• Contact Philips Support regarding antenna system design.

Before You Install an Antenna System

In general, before each antenna system installation, a site frequency plan is required which includes an
appropriate frequency plan for M2720A and all other telemetry devices used in the same hospital.
Using the results of this frequency survey, the appropriate frequency allocation mode must be set for the
M2720A, for example, automatic frequency allocation mode or fixed frequency mode for the base station.
Under normal circumstances, the fixed frequency mode for the transducer should not be used, except for
Japan. See the Service Support Tool Help for further information about choices of frequency allocation
modes.
An antenna system for the M2720A should be designed by an antenna expert experienced in designing
M2600A antenna systems. For antenna system calculations, the specifications for M2720A can be added
to the Antenna System Design Spreadsheet. This is important, because most antenna systems for the
M2720A are non-standard in design, as the RF signal typically needs to be distributed to several rooms.
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Antenna System Guidelines