TB 9-6625-164-24
(5) At each frequency, verify the TI indicates within the corresponding levels listed
in the C-MSG (Loss in dB) column of table 7 below.
Table 7. Receiver Filter.
TI LIMITS
Calibrator Frequency
C-MSG (Loss in dB)
3kHz FLAT(Loss in dB)
200
-27.0 to -23.0
N/A
250
N/A
-0.5 to +0.5
600
-5.7 to -3.7
N/A
1000
REFERENCE
REFERENCE
1004
N/A
-0.6 to +0.4
3000
-3.5 to -1.5
-3.5 to -2.5
4000
-17.5 to -11.5
-6.7 to -5.7
5000
-31.5 to -25.5
N/A
(6) Set the Calibrator OPR/STBY to STBY.
(7) Set TI RX FILTERS C-MSG/3 kHz FLAT/NONE to 3 kHz FLAT and repeat
steps (1) through (5) above using the 3kHz FLAT (Loss in dB) column of table 7 above.
(8) Set TI RX FILTERS C-MSG/3 kHz FLAT/NONE switch to NONE. Set
Calibrator OPR/STBY to STBY and disconnect test setup.
b. Adjustments. No adjustments can be made.
11. Transmission Distortion
a. Performance Check
(1) Set TI controls as follows:
(a) LOOP/NORM
NORM
(b) TX LEVEL (dBm) Slide Switch
Fixed (Right)
USER (Left)/Fixed (Right)
(c) TX LEVEL (dBm) Fixed
0
(d) TX FREQ (HZ) Slide Switch
Fixed (Left)
Fixed (Left)/USER (Right)
(e) TX FREQ (HZ) Fixed
404
600 Ω
(f) Z TX/RX IMPEDANCE
(g) TX MODE
NORM
(h) SF SKIP/NORM
NORM
(i) POWER AUTO/ON/OFF
ON
(2) Set TI TX FREQ (Hz) to VAR and set TI Variable knob for a TI TX FREQ (Hz)
indication of 4000 Hz.
(3) Connect Spectrum Analyzer Input to TI TX connector.
(4) Set Spectrum Analyzer to view the 4000 Hz fundamental signal as well as
several harmonics. Verify that all harmonics are less than <-50 dBc.
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