HP 8753E manual Required Equipment, Procedure for Characterizing a Duplexer, Press=

Required Equipment

Characterizing a duplexer requires that the test signals between the analyzer (a 2-port instrument) and the duplexer (a 3-port device) are routed correctly. This example uses one of the following adapters to perform this function:

nHP 8753E Option K36 duplexer test adapter

nHP 8753E Option K39 3-port test adapter

You must also have a set of calibration standards for performing a full 2-port calibration on your test set up.

Procedure for Characterizing a Duplexer

1.Connect the test adapter to the analyzer according to the instructions for your particular model. Connect any test llxture or cables to the duplexer test adapter.

2.Press=.

3.Set up the stimulus parameters for channel 1 (center/span frequencies, power level, IF bandwidth). This example uses a span of 120 MHz centered at 860 MHz.

PressIcenter)@ZJLM/U)CSpan)(EJLM/U)

4. Uncouple the primary channels from each other:

.,;.,.....,.,..,,...:... . . . . . . . . . . . . . . . . . . . . . .........

Press m), set ~~~~~~ to OFF.

(This is necessary in order to set the test set I/O independently for each channel.)

Note	Make sure you connect the standards to the TX port of the test adapter (or a
	cable attached to it) for the FORWBD calibration and to the Ant port for the
	REVERSE calibration. The LEDs on the test adapter indicate the active ports:
	a brightly lit LED indicates the source port; a dimly lit port indicates the input
	port; an unlit LED indicates no connection.

7.When the calibration has been completed, save the instrument state:

8.Press @iLZiJ

9.Set up channel 2 for the same stimulus parameters as channel 1.

10.Set up control of the test adapter so that channel 2 is measuring the receive path of the duplexer: (Uncoupling the channels allows a different calibration for each signal path.)

11.Perform a full 2-port calibration on channel 2:

2.14 Making Measurements