User's Manual

Table Of Contents

EX7100 Technical Manual - Module Descriptions

5. Adjust the two high adjustment screws on the Duplex filter for the deepest notch on

the low operating frequency of the terminal (See Note1 above). Check that the notch

depth (Isolation Loss) is ≥ 80dB.

6. Check that the Insertion Loss is ≤ 1.0dB.

7. Reconnect all leads to the Duplex filter.

7.10.4 Duplexer Tuning / Performance Checks

With the three sections of the Duplexer connected together as shown in figure 7.27,

check the following performance parameters:

Notch Depth (Isolation Loss)

Low Pass Filter:

1. Connect a 50Ω termination to the antenna port (4).

2. Connect the analyser input to the high frequency port (1).

3. Feed the tracking generator output into the low frequency port (7) 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

notch is ≥80dB. 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 antenna port (4).

2. Connect the analyser input to the low frequency port (7).

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 low frequency, check that the filter notch

is ≥80dB. 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.

Insertion Loss

Low Pass Filter:

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

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

3. Feed the tracking generator output into the low frequency port (7) of the Duplexer.

Set the analyser to the maximum output level available.