VS 2001
Technical Handbook
Troubleshooting
Page 102
Marconi Proprietary information
P/N: 779-0373/02
Revision 02
In these tests, the TETRA TEST SET simulates the TETRA network.
Power Test
When the “CALL MOBILE” button is pressed on the test set, a call is forwarded to
the terminal being tested.
After having pressed the “RF GEN” button, vary the field using the adjustment
knob (see
Fig. 7.8), weakening it and thus forcing the terminal to increase the transmitted
power until reaching its MAX power (1 W for portable terminals, 10 W for
vehicular/fixed terminals). The change in the fluctuating values (in dBm) will be
noted in correspondence to “RX GEN LEVEL”.
Sensitivity Test
The DYNAMIC SENSITIVITY tests are not carried out in the lab; for this reason,
we refer here to STATIC SENSITIVITY.
When the “CALL MOBILE” button is pressed on the test set, a call is forwarded to
the terminal under test.
After having pressed the “RF GEN” button, use the adjustment knob (see
Fig. 7.8) to bring the signal to -112 dBm, starting from a higher value (for example,
-90 dBm).
The call, previously forwarded to the terminal, must remain active up to the value of
-112 dBm; to guarantee this, the terminal under test will bring itself to the MAX
power value transmitted (1 W for portable terminals and 10 W for vehicular/fixed
terminals).
At the end of the test, the operator, besides having carried out the POWER and
SENSITIVITY TESTS, also verifies the accuracy of all of the radio terminal
parameters.
Note
The POWER and SENSITIVITY TESTS are closely correlated; in fact, the power is controlled by varying
the sensitivity and vice versa.
Fig. 7.8:
Adjustment knob
