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11. Adjust C2 and C3 for maximum isolation at the load port A. (This may require
several minor back and forth adjustment for C2 and C3.). At this point, we are
matching the two stages.
12. Restore all connection to step 1 and check insertion loss at the center frequency
with the in connector on the input, and the out on the output. Once this is
completed, reverse the leads and verify the isolation at centre frequency.
13. Optimize loss (VSWR) at the input port using C1 and the output port by adjusting
C4.
14. Final minor optimized adjustments may be required by adjusting C5 and C6 only
for isolation.
Tuning Instructions For The Single Stage Isolator
1. Connect the signal source to the input port of the isolator and monitor the output
port (The 50 Ohm load used in the system must be terminated at the isolator load
port).
2. Adjust capacitors C1 and C2 for minimum insertion loss at the center frequency
(F
).
o
3. Reverse connections to the isolator in/out ports and adjust capacitor C3 to obtain
typical isolation at F
4. Restore the connections as in step 1 and again adjust C1 and C2 for minimum
insertion loss at F
5. Fine tune C1 and C2 for best return loss (VSWR) at both input and output ports,
the readings should agree with the specifications shown in table 1 above for a
single stage isolator.
Tuning Instructions Number 025790 Rev: 1 Date: August 5, 2010
(=35 dB).
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0
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