IFR COM-120B - Page 43

Rev. 1.0 Page 43
3. The menu to the right will appear.
4. Select STEP 10 by positioning the
cursor and pressing F1 Execute.
5. The COM-120B will configure itself
for testing Return Loss.
6. Connect the Load port of the Return
Loss bridge to the 160 MHz port of the
Duplexer Filter.
7. Connect 50-ohm terminations to the
remaining ports on the duplexer.
8. The resulting return loss for the 160 MHz port of the
duplexer is displayed in dB. In this case, the
indicated Return Loss is approximately 31 dB.
TX RX
VSWR /
Return Loss
Bridge