TB 9-6625-2076-24
d. Press and hold SELF TEST.
All 8's will appear on RDL/DDM/MOD,
FREQUENCY, and RF LEVEL display.
e. Release SELF TEST pushbutton. RDL/DDM/MOD display will count. If memory
chip output is incorrect, an error code will be displayed. TI must be repaired
before continuing.
f. When RDL/DDM/MOD display finishes counting, self-test cycle is complete. TI will
be in preset 108.000 MHz VOR mode.
NOTE
In paragraphs 8 through 17 below, when frequency is changed,
the TI will automatically select proper modulation for
frequency selected. Press any TONE SELECT pushbuttons
that are lit to obtain an unmodulated signal unless instructed
otherwise.
8. Frequency
a. Performance Check
(1) Connect frequency counter to TI RF OUT.
(2) Press all TONE SELECT pushbuttons to off position (not lit).
(3) Press RF SELECT FAST and SLOW DECR or FAST and SLOW INCR
pushbuttons as required for a RF LEVEL display of -6 dBmW. Enter frequencies listed in
table 4 into TI. If frequency counter does not indicate within limits specified, perform b
below.
NOTE
To enter a frequency into TI, RF SELECT RF FREQ
Then press DATA ENTRY
pushbutton must be lit.
pushbuttons for desired frequency and press ENTER. If an
error is made while entering frequency and before ENTER is
pressed, press CLEAR and re-enter correct frequency.
Table 4. Frequency Accuracy
Test instrument frequency
Frequency counter indications (MHz)
(MHz)
Min
Max
108.0
107.999784
108.000216
74.600
74.599851
74.600149
75.400
75.399849
75.400151
117.950
117.949764
117.950236
329.150
329.149342
329.150658
335.000
334.999330
335.000670
(4) Enter a frequency of 108.000 MHz into TI.
(5) Press RF SELECT F pushbutton.
