316
Transmitter Fault Finding (>25W)
TM8100/TM8200 Service Manual
© Tait Electronics Limited
November 2007
Task 26 —
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
Table 11.8
(B1),
Table 11.9
(G2),
Table 11.10
(H5) or
Table 11.11
(H7). (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
C3500
(see
Figure 11.21
). Earth the probe to the
FCL TOP
can adjacent to the PA driver circuitry. The required voltage
should be as given in
Table 11.8
(B1),
Table 11.9
(G2),
Table 11.10
(H5) or
Table 11.11
(H7).
5.
Enter the CCTM command
32
to place the radio in receive mode.
6.
If the voltage measured above is correct, go to
Task 27
. If it is not, go
to
Step 7
.
7.
Check
C3500
for VHF and UHF (see
Figure 11.21
) or C300 for
the K5 band (see
Figure 11.22
). If this component is not faulty, go
to
“Frequency Synthesizer Fault Finding” on page 185
. If this
component is faulty, replace it and return to
Step 2
.
Summary of Contents for TM8100 mobiles
Page 1: ...TM8100 mobiles TM8200 mobiles Service Manual MMA 00005 05 Issue 5 November 2007...
Page 10: ...10 TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Page 12: ...12 TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Page 20: ...20 Introduction TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Page 64: ...64 Description TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Page 106: ...106 TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Page 134: ...134 General Information TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Page 168: ...168 Servicing Procedures TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Page 464: ...464 Spare Parts TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
