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TB7100 Service Manual
Transmitter Fault Finding (25W)
259
© Tait Electronics Limited
October 2005
Task 25 —
Output of
Frequency
Synthesizer
The first point to check in the initial RF signal path is the output
SYN TX LO
from the frequency synthesizer. This signal is input to the exciter at C300.
1.
For test purposes select a representative power level and frequency
from
(B1 band) or
(H5, H6). (Note that the
data for these tables were obtained using an RFP5401A RF probe.)
2.
To set the power level, enter the CCTM command
326 x
, where
x
defines the level. To set the frequency, enter the CCTM command
101 x x 0
, where
x
is the frequency in hertz.
3.
Enter the CCTM command
33
to place the radio in transmit mode.
4.
Use an RFP5401A RF probe or the equivalent to measure the RF
voltage after C300 (see
). Earth the probe to the
FCL TOP
can adjacent to the PA driver circuitry. The required voltage should
be as given in
(B1 band) or
(H5, H6).
5.
Enter the CCTM command
32
to place the radio in receive mode.
6.
If the voltage measured above is correct, go to
. If it is not, go
to
7.
Check C300 (see
). If C300 is not faulty, go to
“Frequency Synthesizer Fault Finding” on page 143
. If C300 is
faulty, replace it and return to
Summary of Contents for TB7100
Page 1: ...TB7100 base station Service Manual MBB 00005 01 Issue 1 October 2005...
Page 18: ...18 Mechanical Design TB7100 Service Manual Tait Electronics Limited October 2005...
Page 38: ...38 Functional Description TB7100 Service Manual Tait Electronics Limited October 2005...
Page 62: ...62 Circuit Descriptions TB7100 Service Manual Tait Electronics Limited October 2005...
Page 124: ...126 Servicing Procedures TB7100 Service Manual Tait Electronics Limited October 2005...
Page 140: ...142 Interface Fault Finding TB7100 Service Manual Tait Electronics Limited October 2005...
Page 216: ...218 Receiver Fault Finding TB7100 Service Manual Tait Electronics Limited October 2005...
Page 366: ...368 CODEC and Audio Fault Finding TB7100 Service Manual Tait Electronics Limited October 2005...