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LPB Communications, Inc.
311 Spruce St.
Camden NJ 08103
856 365-8585 Phone
856 365-8999 Fax
www.lpbinc.com
Operating Instructions
ATU-20
1
Place S1 in Match position
2
Place S2 in Forward (FWD) position. Meter should indicate full scale. If not, adjust R8 to achieve full-scale reading.
3.
Place S2 in reflect (REF) position.
4.
Set S3, S4, S5, and S0 for minimum meter reading. A patient, systematic approach must be taken to test all possible
combinations of impedance compensation and capacitance cancellation to achieve the lowest meter reading.
5.
Determine the SWR. Set S2 in forward (FWD)
Adjust R8 for full scale (1.0)
Set S2 in reflect (REF), note reading and calculate.
1 .0
+
reading
= SWR
1.0- reading
NOTE: The meter reading in REF must be approx. 0.3 or lower (2: 1 or better SWR) for proper transmitter
operation.
6.
Set Sl to
Operate
7.
Reduce transmitter RF power to the minimum necessary for desired area coverage.