132 Power Amplifier Fault Finding TB8100 Service Manual
© Tait Electronics Limited September 2006
8.3 Test Equipment
Important The PA has been calibrated in the factory to within 0.1dB
at the N-type connector into a load of less than 1.2:1
VSWR. Measurements will vary according to the type of
test equipment used, and the length and quality of the RF
leads used. We recommend that you verify the accuracy of
your test equipment before calibrating the PA.
Recommended Test
Equipment
The following test equipment is required for carrying out the PA fault
finding procedures:
■ PC with the latest version of the TB8100 Service Kit (refer to “Software
and Firmware Compatibility” on page 136).
Note The Calibration Kit is also installed when you install the Service
Kit. If you need to reprogram any factory parameters into the PA,
you will need to use a dongle with the Calibration Kit.
■ Operational and calibrated reciter of the same frequency band as the PA
under test (refer to “Software and Firmware Compatibility” on
page 136).
■ Operational and calibrated PMU.
■ TB8100 subrack complete with control panel, front panel, and
appropriate interconnecting cables.
■ TBA0ST1, TBA0STU or TBA0STP calibration and test unit (CTU)
with supplied cables.
■ Oscilloscope.
■ RF power meter capable of measuring 150W.
■ Multimeter.
■ 50Ω load (power rating greater than 150W, input VSWR less than
1.2:1).
■ Coaxial flying lead for checking the RF output power from the 6W or
60W board (connects between the PCB and RF power meter).
The following items of equipment are also specifically required for testing a
12V PA:
■ DC power supply capable of providing at least 12.5V at 11A (the
standard test voltage is 12.5V).
■ Subrack fitted with a dual base station subrack interconnect board (IPN
220-02037-04 or later). Refer to “Replacing the Subrack Interconnect
Board” in the Installation and Operation Manual (MBA-00005-xx) for
more details about this board and its switch settings.
12V
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