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Tuning Instructions Number 025790 Rev: 1 Date: August 5, 2010
Tuning Instructions For The Dual Stage Isolator
1. Connect the signal source to the input port and monitor the output port. (The 50
ohms load used in the system must be terminated at the load ports).
2. Adjust capacitors C1 through C4 for minimum insertion loss at the centre
frequency.
3. Reverse the equipment in/out connection to the isolator and remove the 50 Ohm
load from the isolator port B.
4. Adjust C5 to obtained maximum isolation of 35dB at the centre frequency. At this
stage, we are adjusting the isolation of the first stage of the isolator.
5. Reverse the leads and check to make sure the VSWR is balanced and at its
lowest at the frequency of interest, F
o
6. Remove the load from port A and connect the 50 ohm load that was originally on
port B back to port B.
7. Reverse the leads once again.
8. Adjust C6 to obtained maximum isolation of 35 dB at the centre frequency. Now,
we are adjusting the isolation of the second stage.
9. Reverse the leads and check to make sure the VSWR is balanced and at its
lowest at the frequency of interest, F
o
10. Connect the signal sources to the input port of the isolator and monitor the port
A. (Terminate the output port and port B with the 50 Ohm loads).
