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which are near the RX port and then make the dip move to mark2 position as well as
to make them superposition possibly. Fine-tune these three screws repeatedly from
center to right side one by one under the monitoring of mark2's S reading. In normal
situation, it should be down to -60dB.
Chart 4-1: Example for connection method of duplexer measurement
Adjust the central frequency and sweeping span to make the new curve zoomed
in. Then adjust the positions of maker1 and marker 2. Finally connect the testing ca-
bles with a thru, to perform user calibration.
Then connect instrument's output port with duplexer's TX port again, connect
input with ANT port. Finally connect a dummy load to RX port. Fine-tune the three
screws repeatedly from center to right side one by one to make the reading of mark1
as low as possible. In normal situation it should be lower than -70dB. In this time,
read the S parameter of mark2, which is the duplexer's insertion loss to the transmit
signal.
Firstly, connect the output port to ANT port and connect the input port to RX
port. Then connect the dummy load to TX port. After that, fine-tune the three screws
on the RX side to make mark2's reading minimum. In normal situation, it should be
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