User's Manual

Table Of Contents

EX7100 Technical Manual - Module Descriptions

7.10.2 Testing and Fault Diagnosis

General

Note: Refer to Section 5 “Troubleshooting the EX7100” before reading this Section.

The Duplexer is a passive product that once correctly aligned should provide stable

performance without failure.

The major failure modes of Duplexers are:

> Connectors not being fully mated or cable failure.

> Incorrect Duplexer tuning, causing degraded transmitter and/or receiver

performance.

> Mechanical failure of internal components, usually causing complete failure of the

link.

Fault-finding methods are:

1. Check that the RF connectors are fully mated.

2. Substitute the Duplexer for one that is known to be correctly tuned or

3. Check the Duplexers performance using a network analyser (refer to Section 7.10.3).

Checking RF Connectors

With the terminal de-powered, check that the eight RF connectors on the Duplexer are

fully mated. Similarly, check that the two RF connectors on the terminal rear panel are

fully home.

If no problems are found with the connections, either check the performance of the

Duplexer with an analyser (refer Section 7.10.3) or replace the Duplexer (refer Section

7.10.5).

7.10.3 Alignment

UHF Module Re-tuning

Duplexer adjustment requires the use of a scalar network analyser with the performance

outlined in Table 7.4 below.

Measurement Preferred Capability Minimum Capability

Transmission: Dynamic Range

& Isolation

95dB 80dB

Return Loss: Capability 30dB 20dB

Table 7.4: Required Measurement Capability