TB 9-6625-2211-24
(5) Repeat (4) above with SIG GEN FUNCTION switch set to SWP 15 MHz.
(6) Repeat (3) through (4) above, adjusting SUM ATTEN control to -10 dB.
Measuring receiver will indicate -10 l dBm.
(7) Set SIG GEN FUNCTION switch to FIXED FREQ. Adjust SUM ATTEN
control for a -10.0-dBm indication on measuring receiver.
(8) Disconnect power meter from TI. Connect CHANNEL 1 of receiver system to
SUM RF IN/OUT, using attenuator (fixed).
(9) Establish a 0.0-dB reference on receiver system.
(10) Adjust SUM ATTEN control to the first setting in table 14. Measuring receiver
will indicate within limits specified.
(11) Repeat technique of (8) above for remaining SUM ATTEN control settings
listed in table 14. Measuring receiver will indicate as specified.
Table 14. Output Power
SUM ATTEN or
Measuring receiver
DIFF/INTERLEAVE ATTEN
indications
control settings
(dB)
(dB)
20
20
r1
30
30
r1
40
40
r1
50
50
r1
60
60
r1
70
70
r1
80
80
r1
90
90
r1
(12) Repeat (3) through (10) above using the DIFF RF IN/OUT output and
substituting the DIFF/INTERLEAVE ATTEN control for the SUM ATTEN control.
b. Adjustments. Adjust A11R2 (fig. 1) for a 0.0-dBm indication on power meter (R).
18. Modulator and Demodulator Accuracy
a. Performance Check
(1) Position controls as listed in 7 d above.
(2) Connect equipment as shown in figure 10, connection A.
(3) Adjust oscilloscope controls as necessary to display TI pulse train on Channel 1.