User's Manual

Table Of Contents

EX7100 Technical Manual - Module Descriptions

4. With the tracking generator output set to the low frequency, check that the filter

insertion loss is < 2.0dB (1.5-2.0dB typical). If a non-compliance is observed, the

Duplexer tuning screws F, G, H, I may be slightly

adjusted. Upon adjustment, all

performance parameters of the Duplexer must be re-checked.

High Pass Filter:

1. Connect a 50Ω termination to the low frequency port (7).

2. Connect the analyser input to the Antenna port (4).

3. Feed the tracking generator output into the high frequency port (1) of the Duplexer.

Set the analyser to the maximum output level available.

4. With the tracking generator output set to the high frequency, check that the filter

insertion loss is < 2.0dB (1.5-2.0dB typical). If a non-compliance is observed, the

Duplexer tuning screws B, C, D, E may be slightly

adjusted. Upon adjustment, all

performance parameters of the Duplexer must be re-checked.

Note: Reconnect all cables as per Figure 7.27

7.10.5 UHF Duplex Filter Replacement Procedure

Note: Ensure that the replacement module has been correctly tuned to the operating

frequencies required before installation (refer to Section 7.10.3 above)

1. Isolate the EX7100 Terminal from the incoming DC supply by removing the DC input

wires from the rear panel terminal block.

2. Note the connector positions and the way that the cables are run (it is important that

all cables are replaced as they were initially run before the module replacement

procedure). Disconnect the coax cables from the Duplexer.

3. Remove the fasteners holding the Duplexer to the cover and lift it clear.

4. Fasten the new Duplexer to the cover.

5. Reconnect the coaxes to the positions recorded previously.

6. Inspect the EX7100 terminal to ensure that it is free of foreign material. Remove and

clean as required.

7. Connect the antenna to the terminal. Apply power to the EX7100 rear panel and

switch the terminal on.

4. Check that the received signal strength (RSSI) and forward power are at the levels

expected and that the VSWR alarm is not being generated.