TB 9-6625-2276-24
Table 3. Pre-amp Gain Worksheet Continued
Test
Measuring
PRE-AMP
receiver
Attenuator
gain
Reference
Raw gain
settings
indication
actual value
1
(dBm)
(dBm)
(dBm)
(MHz)
(dBm)
(dBm)
100.0
300.0
500.0
700.0
900.0
1100.0
1300.0
1Treat
as positive value.
(4) Set attenuator to 20 dBm (attenuator remains set at 20dBm throughout procedure).
(5) Turn signal generator RF output off, connect attenuator at the insertion point as
(6) Record measuring receiver indication in the measuring receiver indication
(7) Algebraically subtract measuring receiver indication value recorded in table 3
from +10.0 dBm. Record difference in attenuator actual value column in table 3.
(8) Turn signal generator RF output off, remove attenuator from equipment setup.
(9) Repeat (1) through (8) above for remaining test frequency settings listed in table 3.
(10) Algebraically add -40 dBm to attenuator actual value recorded in table 3 for test
frequency setting of 0.10 MHz. Record sum in reference column in table 3.
NOTE
Treat attenuator actual value as a measuring receiver positive
number for (10) above.
(11) Repeat (10) above for each test frequency setting listed in table 3.
(13) Adjust signal generator amplitude controls for a measuring receiver indication
equal to reference recorded in table 3 for test frequency setting of 0.10 MHz.
(14) Turn signal generator RF output off; connect equipment as shown in figure 2.
(15) Turn signal generator RF output on and record measuring receiver indications
(16) Turn signal generator RF output off and disconnect TI from equipment setup.
(17) Repeat technique of (12) through (16) above for remaining test frequency
(18) Algebraically subtract raw gain value for 0.10 MHz row from -40 dBm. Record
difference in PRE-AMP gain column in table 3.
5