TB 9-6625-1932-35
(32) Disconnect TI from directional coupler No. 1 (No. 2) and connect fixed short to
directional coupler No. 1 (No. 2) point A (fig. 4).
(33) Repeat technique of (29) through (32) above 2 more times and average values.
(34) Determine VSWR using appendix B. VSWR will be within the limits listed in
(35) Repeat technique of (26) through (34) above for remaining cardinal test point
frequencies determined in 7c above.
(36) Connect equipment as shown in figure 5 and allow equipment to warm up for 3
hours.
(37) Adjust programmable sweep generator CW-F1 frequency controls to first
cardinal test point frequency determined in 7c above.
(38) Adjust programmable sweep generator LEVEL output controls for +3 dBm.
(39) Determine signal generator frequency
(LO)
required
for
the
desired
measurement by calculating the following equation:
LO = (RF-IF) / 2
Where:
RF= Frequency of programmable sweep generator (37) above.
IF= Intermediate frequency at which receiver system
is
to
perform
measurement (0.700 GHz).
EXAMPLE:
Let IF = 0.700 GHz
Let RF = 18 GHz (37) above
Let LO = signal generator frequency
LO =
(RF-IF) / 2
LO =
(18 GHz-0.700 GHz) / 2
LO =
17.3 GHz / 2
LO =
8.65 GHz
and RF output controls for +8 dBm.
(41) Establish a 0.00 dB reference on receiver system at 0.700 GHz.
12