TROUBLESHOOTING 9 - 3
For RF levels, which should be measured with a 50 Ohm RF probe, you can use the following cir-
cuit.
Figure 9-3 Example for 50 Ohm RF Probe
Troubleshooting Flowcharts
Use the following flowcharts to troubleshoot the terminal.
These flowcharts contain procedures which use the TETRA COM SW application to set the
terminal into the appropriate test modes for troubleshooting terminals having digital,
receiver, transmitter, or frequency generation failures.
The terminal performs most of the used TETRA COM commands only in test mode. If not in
test mode, it ignores these commands.
To enter test mode you must enter the command "TEST_ENTER" in TETRA COM.
After about 18 seconds the TETRA COM screen must show the message "Radio HW is
READY" to indicate that the terminal has entered test mode.
Once in test mode, you don't have to use this command again until the test mode is termi-
nated or the terminal performed a reset.
1000pF
1K
F + DC Signal
To 50 Ohm Input
6866539D31.book Page 3 Tuesday, March 20, 2007 6:32 PM
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