TB 9-6625-2249-24
(28) Determine 20 dB attenuator (fixed) correction factor at 11 GHz from test report.
Record correction factor.
NOTE
Treat 20 dB attenuator (fixed) test report value as negative
number.
EXAMPLE:
- 20.1 test report value
-20.1
--20.0 nominal attenuator value ++20.0
00.1 correction factor
(29) Algebraically subtract correction factor determined in (28) above from 0 dBm.
Record difference.
EXAMPLE:
0.00 dBm (29) above
-10.1
--10.0 nominal attenuator value ++0.10 dBm difference
(30) Adjust synthesized signal generator level output controls to value recorded in
(29) above on power meter.
(31) Adjust A4R23 (fig. 5) for a +20.0 dBm indication on TI display (R).
NOTE
A4R23 (fig. 5) will be adjusted for best compromise between
+10 and +20, indications on TI display.
EXAMPLE:
Ideal compromise is the equal but opposite offset from nominal values with the +10 dBm power level at
the lower tolerance level and the +20 dBm power level at the upper tolerance level. If +10 power level
is +9.7 then the +20 power range should be +20.3 dBm.
(32) Algebraically subtract correction factor determined in (28) above from -10 dBm.
Record difference.
(33) Adjust synthesized signal generator level output controls for a power meter
indication equal to the value determined in (32) above.
(34) If TI display does not indicate between +9.7 and 10.3 dBm, adjust A4R23 (fig. 5)
for TI display lower intolerance indication.
(35) Repeat (30) above. If TI display does not indicate between +19.7 and +20.3 dBm,
adjust A4R23 (fig. 5) for a TI display higher intolerance indication.
(36) Repeat (30) through (35) until TI indications for both the +10 and +20 dBm
power levels are within tolerance.
(37) Confirm TI display indications are still in tolerance by performing (a) through
(e) below. If TI display indications listed in (d) and (e) below are not within the specified
limits, perform (24) through (37) above.
(a) Disconnect 20 dB attenuator (fixed) from figure 4 equipment setup.
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