TB 9-6625-2340-35
(75) Calculate the third order intercept using the formula below. Calculated value
will be within the limits specified in the first row of table 35.
Adjusted output level + absolute value/2 = third order intercept
(76) Repeat technique used in (52) through (75) above for remaining settings in table
Signal generator
Signal generator
No. 3
No. 2
Test instrument
Values
CF
Adjusted
Adjusted
Calculated
Peak
Peak
Step
Center
output
output
limit
Absolute
search
search
Size
freq.
level
Freq.
level
Freq.
(dBm)
value
2
1
(MHz)
(GHz)
(dBm)
(GHz)
(dBm)
(GHz)
3.9995
4.0005
3.9995
1
-20
-20
>7
8.9995
9.0005
8.9995
1
-20
-20
>5
13.9995
14.0005
13.9995
1.002
-20
-20
>5
(77) Disconnect signal generator No. 2 RF OUTPUT from power splitter.
(78) Reconnect coax cable between signal generator No. 2 RF OUTPUT and the
measuring receiver microwave converter LO INPUT.
b. Adjustments. None
23. Out of Band Response
a. Performance Check
(1) Press TI keys as listed in (a) through (c) below:
(a)
2-22 GHz.
(b)
CENTER FREQUENCY, 3, GHz.
(c)
FREQUENCY SPAN, 100, kHz.
(2) Connect TI 10 MHz OUT (rear panel) to signal generator No. 3 EXT REF IN
(rear panel).
(3) Connect TI RF INPUT to signal generator No. 3 RF OUTPUT.
of 0 dBm.
(5) Press TI MARKER PRESEL PEAK key and wait for (PEAKING!) on TI to
disappear.
(6) Press TI MARKER OFF key.
(7) Adjust signal generator No. 3 output level to place the peak of the signal trace
at the top TI graticule line.
(8) Press TI keys as listed in (a) through (d) below:
(a)
MARKER PEAK SEARCH.
DISPLAY LINE ENTER, 70, -dBm.
(b)
69