Manual

Table Of Contents

ANSI C63.17-2006

Methods of Measurement of the Electromagnetic and Operational Compatibility of UPCS Devices

Difficulty in definitive monitoring testing comes from several potential sources as follows:

⎯ EUTs may be designed to operate only together with other devices of like type.

⎯ EUTs may select a channel or stop operating when interfering radio signals are detected in their

channel.

⎯ EUTs may transmit intermittently, and thus their modes of operation may be difficult to detect.

In the monitoring tests, interference is introduced to some unused regions of the band in order to confine

the operation of the EUT to one region, or, if available, carrier and/or access channel administration

commands are used to confine operation of the EUT to one region. For the purposes of many of the tests, it

is sufficient to confine the EUT to operate in a restricted a region in the frequency domain, e.g., one or two

carriers of the EUT. This is illustrated by Figure 5 and Figure 6. Since a channel is a combined time and

spectrum window, for some tests it may be desirable to use gated interference to implement a similar

restriction of operation in the time domain.

Administrative test commands are preferred when available. When using out-of-region interference, the

power falling into the adjacent carrier of the EUT could potentially corrupt the test on the wanted carrier,

especially if the EUT has poor adjacent channel rejection properties.

7.1.1 Monitoring test setup

Figure 5 illustrates the concept of operating regions within the band and shows how interference is

provided outside of the operating region.

Figure 5

—Operating region within UPCS band

Figure 6 illustrates the concept of adding interference into the selected operating region to test for

compliance with the threshold limits. With this arrangement, the test requirement is to observe if the EUT

transmits in the one region where the threshold is being tested. The out-of-operating-region interference is

not required during the tests if the EUT is designed to operate in a sngle fixed channel of the UPCS band,

or if the EUT can be restricted to selected channels using frequency administration commands.

For the monitoring tests, the general equipment configurations are shown in Figure 7 and Figure 8. The

EUT may be arranged to communicate via radio signals between itself and another compatible device (the

companion device). Typically, the devices provide two-way communications, and one device should be

designated as the monitoring transceiver under test (the EUT). Figure 7 illustrates radiated communication

between the EUT and the instruments; Figure 8 illustrates conducted communication.

Some UPCS devices may have the capability to restrict the device’s operation to a subset of the available channels.

The interference antenna must transmit at least 10 dB higher power to the monitoring EUT than to the companion device.

Otherwise, the operation of the EUT may be masked by the undesired response of the companion device to an above-threshold

interference signal.

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