User's Manual

Table Of Contents

EX7100 Technical Manual - Module Descriptions

7.9.4 VHF Duplex Filter Replacement Procedure

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

frequencies required before installation (refer to Section 7.9.3 above)

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

wires from the rear panel terminal block.

2. Remove the top cover as described in Section 6.1.

3. 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 three coax cables from the Duplexer.

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

5. Fit the new Duplexer over the threaded studs and replace the fasteners. Tighten the

fasteners.

6. Reconnect the three coaxes to the positions recorded previously.

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

clean as required.

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

switch the terminal on.

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

expected and that the VSWR alarm is not being generated.