TB 9-4920-460-24
Table 8. TxDirect COMM DAC Table Adjustment - Continued
Measuring receiver indications
Test instrument
(dBm)
Frequency settings
Power output
Min
Max
(MHz)
(dBm)
265
-25
-27
-23
275
-25
-27
-23
285
-25
-27
-23
295
-25
-27
-23
300
-25
-27
-23
310
-25
-27
-23
320
-25
-27
-23
330
-25
-27
-23
340
-25
-27
-23
350
-25
-27
-23
360
-25
-27
-23
370
-25
-27
-23
380
-25
-28
-22
390
-25
-28
-22
400
-25
-28
-22
(20) Use the up or down arrow keys on the keypad, until MB is displayed.
NOTE
The up / down arrow keys will advance to VOR, LOC, GS, and
ILS modes. The left / right keys will change frequencies within
selected mode.
(21) If measuring receiver does not indicate within limits specified in table 9 for each
mode selected, use the TI RF OUTPUT toggle switch to adjust TI as close as possible to
nominal.
Table 9. TxDirect MB DAC Table Adjustment.
Measuring receiver
Test instrument
indications
(dBm)
Mode
Power out
Min
Max
(dBm)
MB 75 MHz
-25
-27
-23
L/V 108.05 MHz
-25
-27
-23
L/V 113.00 MHz
-25
-27
-23
L/V 117.95 MHz
-25
-27
-23
GS 108.95 (329.15) MHz
-30
-32
-28
GS 109.30 (332.00) MHz
-30
-32
-28
GS 110.30 (335.00) MHz
-30
-32
-28
ILS 110.10 MHz
-25
-27
-23
9. VOR Modulation
a. Performance Check
(1) Set TI switches as outlined in 7 a above.