TB 9-4931-523-35
(11) Repeat (9) and (10) above for each setting on TI dial or other desired setting.
(12) Disconnect TI from equipment setup and repeat (1) through (11) above for
remaining test frequencies of interest.
b. Adjustments. No adjustments can be made; however, a corrective chart may be
prepared showing actual attenuation value at frequencies recorded in 7a above.
12. Fixed Attenuation
Measurement (26.5 to 40 GHz)
a. Performance Check
desired measurement by calculating the following equation:
RF = Test frequency in GHz (7a above) / 3
EXAMPLE A
If first test frequency recorded in 7a above is 27 GHz:
RF
=
27/3
RF
=
9 or 9 GHz
(2) Determine and record signal generator No. 1 frequency (LO) required for the
desired measurement by calculating the following equation:
LO =(3 X RF) -IF)/ 2
EXAMPLE B
Where:
RF
=
signal generator No. 2 frequency in GHz recorded in (1) above
IF
=
1 (operating frequency of receiver system in GHz)
LO
=
signal generator No. 1 frequency
Where:
LO
=
(3x9)-l)/2
LO
=
(27 - 1) / 2
LO
=
26/2
LO
=
13 or 13 GHz
(3) Adjust signal generator No. 2 frequency controls to value determined in (1)
above and RF output controls to +3 dBm.
(4) Adjust signal generator No. 1 frequency controls to value determined in (2)
above and RF LEVEL output controls to 0 dBm.
NOTE
Use adapters as needed.
(6) Establish a reference on receiver system at 1 GHz.