Tait TM9100 Service Manual page 355

The first point to check in the initial RF signal path is the output
Task 25 —
Output of
from the frequency synthesizer. This signal is input to the exciter at C300.
Frequency
Synthesizer
1.
2.
3.
4.
5.
6.
7.
TM9100 Service Manual
© Tait Electronics Limited August 2005
For test purposes select a representative power level and frequency
from Table 12.8 (B1 band) or
data for these tables were obtained using an RFP5401A RF probe.)
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.
Enter the CCTM command 33 to place the radio in transmit mode.
Use an RFP5401A RF probe or the equivalent to measure the RF
voltage after C300 (see Figure
can adjacent to the PA driver circuitry. The required voltage should
be as given in Table 12.8
Enter the CCTM command 32 to place the radio in receive mode.
If the voltage measured above is correct, go to
to Step 7.
Check C300 (see Figure
"Frequency Synthesizer Fault Finding" on page
faulty, replace it and return to
Transmitter Fault Finding (25W Radios)
Table 12.9 (H5, H6). (Note that the
12.15). Earth the probe to the
(B1 band) or Table 12.9
Task
12.15). If C300 is not faulty, go to
169. If C300 is
Step 2.
SYN TX LO
FCL TOP
(H5, H6).
26. If it is not, go
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